### Known Issues in 2021.1.15f1

*   Ads: \[Android\] Unity Ad return app to Lock screen ([1281041](https://issuetracker.unity3d.com/issues/android-unity-ad-return-app-to-lock-screen))
    
*   AI: Crash with ComputeTileMeshJob when generating Navmesh ([1329346](https://issuetracker.unity3d.com/issues/crash-with-computetilemeshjob-when-generating-navmesh))
    
*   Asset Import Pipeline: Editor crashes while exiting play mode ([1328667](https://issuetracker.unity3d.com/issues/editor-crashes-while-exiting-play-mode))
    
*   Asset Importers: \[MacOS\] Second Unity instance in Activity Monitor is "not responding” after importing ([1331736](https://issuetracker.unity3d.com/issues/macos-second-unity-instance-in-activity-monitor-is-not-responding-after-importing))
    
*   Audio: Crash on AudioMixer\_CUSTOM\_FindSnapshot when passing null as an argument to FindSnapshot() ([1341752](https://issuetracker.unity3d.com/issues/crash-on-audiomixer-custom-findsnapshot-when-passing-null-as-an-argument-to-findsnapshot))
    
*   Global Illumination: Crash while sculpting Terrain and Baking Lightmaps ([1266511](https://issuetracker.unity3d.com/issues/crash-while-sculpting-terrain))
    
*   Global Illumination: \[LightProbes\] Probes lose their lighting data after entering Play mode when Baked and Realtime GI are enabled ([1052045](https://issuetracker.unity3d.com/issues/light-probes-lose-their-lighting-data-after-entering-play-mode-when-baked-and-realtime-gi-are-enabled))
    
*   Graphics Device Backends: CommandBuffer native plugin events hang in the Editor ([1308216](https://issuetracker.unity3d.com/issues/commandbuffer-native-plugin-events-hang-in-the-editor))
    
*   IMGUI: Editor's Toolbar is sometimes replaced by a white bar when opening any Scene ([1341951](https://issuetracker.unity3d.com/issues/white-screen-replaces-the-play-scale-position-bars-editor-cannot-play))
    
*   Input: Touch Input doesn't work in Play Mode when running an Editor on a Touchscreen device ([1341159](https://issuetracker.unity3d.com/issues/touch-input-doesnt-work-in-play-mode-when-running-an-editor-on-a-touchscreen-device))
    
*   Linux: Editor crashes at 'GfxFramebufferGLES::SetBackBufferColorDepthSurface' or freezes when creating a new shortcut profile ([1334874](https://issuetracker.unity3d.com/issues/editor-crashes-at-gfxframebuffergles-setbackbuffercolordepthsurface-or-freezes-when-creating-a-new-shortcut-profile))
    
*   Linux: Linux Editor crashes at "\_XFreeX11XCBStructure" when loading tutorials ([1323204](https://issuetracker.unity3d.com/issues/linux-editor-crashes-at-xfreex11xcbstructure-when-loading-tutorials))
    
*   Metal: Performance in Game View is significantly impacted by Gfx.WaitForPresentOnGfxThread when a second monitor is connected ([1327408](https://issuetracker.unity3d.com/issues/performance-in-game-view-is-significantly-impacted-by-gfx-dot-waitforpresentongfxthread-when-a-second-monitor-is-connected))
    
*   Mobile: \[Android\] App stops due to OnPixelCopyFinishedListener not being supported on devices with lower than 24 SDK ([1331290](https://issuetracker.unity3d.com/issues/app-stops-due-to-onpixelcopyfinishedlistener-not-being-supported-on-devices-with-lower-than-24-sdk))
    
*   Mobile Graphics: \[iOS\] Player crashing when connecting external Display via USB-C port ([1321153](https://issuetracker.unity3d.com/issues/ios-player-crashing-when-connecting-external-display-via-usb-c-port))
    
*   Packman: User can't easily configure location of both UPM and Asset Store package local cache ([1317232](https://issuetracker.unity3d.com/issues/user-cant-easily-configure-location-of-both-upm-and-asset-store-package-local-cache))
    
*   Quality of Life: Crash in SerializedProperty::IsValid when reordering a SerializedProperty list ([1320319](https://issuetracker.unity3d.com/issues/crash-in-serializedproperty-isvalid-when-reordering-a-serializedproperty-list))
    
*   Scene Management: Crash on BuildPrefabInstanceCorrespondingObjectMap when overriding nested prefab inside AssetDatabase.StartAssetEditing() block ([1324978](https://issuetracker.unity3d.com/issues/crash-on-buildprefabinstancecorrespondingobjectmap-when-overriding-nested-prefab-inside-assetdatabase-dot-startassetediting-block))
    
*   Scripting: Crashes on mono\_class\_init when entering Play Mode after recompiling scripts ([1262671](https://issuetracker.unity3d.com/issues/crashes-on-mono-class-init-when-entering-play-mode-after-recompiling-scripts))
    
*   Scripting: DomainReloadTests performance tests have regressed due to removal of built-in support for Visual Studio as a code editor ([1336648](https://issuetracker.unity3d.com/issues/domainreloadtests-performance-tests-have-regressed-due-to-removal-of-built-in-support-for-visual-studio-as-a-code-editor))
    
*   Scripting: Increased Script Assembly reload time ([1323490](https://issuetracker.unity3d.com/issues/increased-reload-time))
    
*   Terrain: Terrain Lit Opacity as Density option causes alpha'd areas on the 5th layer or greater to appear with artifacts ([1283124](https://issuetracker.unity3d.com/issues/terrain-lit-opacity-as-density-option-causes-alphad-areas-on-the-5th-layer-or-greater-to-appear-with-artifacts))
    
*   Video: Video player fails to start playing and null handle errors are thrown when running Unity Editor/Build with specific hardware ([1237818](https://issuetracker.unity3d.com/issues/video-player-fails-to-start-playing-and-null-handle-errors-are-thrown-when-running-unity-editor-slash-build-with-specific-hardware))
    
*   Vulkan: Linux Editor using Vulkan crashes at " GfxDeviceVK::EnsureValidBackbuffer" when showing tooltips for ProBuilder buttons ([1335846](https://issuetracker.unity3d.com/issues/linux-editor-using-vulkan-crashes-at-gfxdevicevk-ensurevalidbackbuffer-when-showing-tooltips-for-probuilder-buttons))
    
*   Windows: Editor crashes when exiting and keeping a tutorial project ([1338299](https://issuetracker.unity3d.com/issues/editor-crashes-when-exiting-and-keeping-a-new-micrograme-project))
    

### 2021.1.15f1 Release Notes

#### API Changes

*   Physics: Added: Added a property for retrieving ArticulationBody components during a collision event. Articulation bodies can be retrieved by Collision.articulationBody
    
*   Physics: Added: Added a property for retrieving either ArticulationBody or Rigidbody components to collision events under Collision.body.
    

#### Changes

*   Android: Allow Android Player to use Vulkan on GPUs that are currently unknown to Unity on Android 11 or newer.
    
*   Package: Updated Code Coverage package to v1.0.1. This version includes improvements and fixes.
    

#### Fixes

*   Asset Pipeline: Fixed problem with old script type dependencies. In some cases they could result in (incorrect) artifact match. ([1340159](https://issuetracker.unity3d.com/issues/nested-prefabs-script-values-get-reset-to-default-when-upgrading-to-2019-dot-4-23f1-or-above))
    
*   Audio: Fixed OnAudioFilterRead not working as expected with respect to the component enable checkbox. (1338710)
    
*   Audio: One of two looping sounds sometimes disappears when removing High Pass Filter Component. ([1323353](https://issuetracker.unity3d.com/issues/one-of-two-looping-sounds-sometimes-disappears-when-removing-high-pass-filter-component))
    
*   Editor: Fixed async loading of SettingsWindow (this solves the current error being reported during layout loading. ([1321185](https://issuetracker.unity3d.com/issues/xr-sdk-failed-to-load-window-layout-pop-up-error-is-thrown-when-project-is-reopened-with-openvr-package-installed))
    
*   Editor: Fixed exception is thrown when right clicking on an object field without a valid serialized property. (1334268)
    
*   Graphics: D3D12 player will not crash/freeze when switching between full screen modes. ([1318640](https://issuetracker.unity3d.com/issues/dx12-player-freezes-and-slash-or-crashes-when-switching-between-full-screen-modes))
    
*   Graphics: Fixed inconsistency in anisotropic level setting across temporary RenderTextures. (1319319)
    
*   IL2CPP: Prevent an crash in the runtime when a managed thread object that has been destroyed is used from a finalizer. ([1341024](https://issuetracker.unity3d.com/issues/il2cpp-crash-when-clearing-up-tcp-threads-in-an-object-finalizer))
    
*   iOS: Fixed crash when using several Application.RequestUserAuthorization in coroutine. ([1323715](https://issuetracker.unity3d.com/issues/ios-crash-on-scriptinggchandle-acquire-when-calling-requestuserauthorization-with-an-already-pending-request))
    
*   iOS: Fixed input being swallowed input on native UITextField when using UaaL and Bluetooth keyboards. ([1332925](https://issuetracker.unity3d.com/issues/uaal-ios-native-ios-uitextfields-do-not-respond-to-an-external-bluetooth-keyboard))
    
*   Networking: Fixed error in console when certificate handler is used. ([1337750](https://issuetracker.unity3d.com/issues/forcedscopedthreadattach-error-is-thrown-when-sending-a-unitywebrequest-with-a-custom-certificatehandler))
    
*   Networking: Updated UploadHandlerRaw to accept null, empty array or empty NativeArray payload. ([1324331](https://issuetracker.unity3d.com/issues/uploadhandlerraw-throws-argumentexception-when-a-null-gets-passed-as-the-postdata-parameter-to-the-www-contsructor))
    
*   Particles: Fixed not correctly supportint 16-bit vertex attributes in CPU mesh particle rendering. ([1340944](https://issuetracker.unity3d.com/issues/particle-system-renderer-mesh-artefacts-when-position-slash-normal-attributes-are-set-to-float16))
    
*   Physics: Corrected contact event behavior for the ArticulationBody component so that it matches Rigidbody component behavior. ([1339908](https://issuetracker.unity3d.com/issues/physics-articulation-body-collision-doesnt-call-oncollisionenter-when-listening-from-parent-and-colliding-with-child))
    
*   Scripting: Fixed .Net Ping.Send() throwing NotSupportedException. ([1329962](https://issuetracker.unity3d.com/issues/dot-net-ping-dot-send-throws-notsupportedexception))
    
*   Scripting: Fixed editor crash when a script has a never ending recursion ([1339503](https://issuetracker.unity3d.com/issues/editor-crashes-on-mono-log-write-logfile-when-a-script-has-a-never-ending-recursion))
    
*   UI: Backout an optimization of caching the change count where the layout is changed during a layout call. ([1324089](https://issuetracker.unity3d.com/issues/ui-layout-is-distorted-when-scaling-using-sizedelta))
    
*   Video: FIxed video clip with unsupported audio track not usable. ([1327470](https://issuetracker.unity3d.com/issues/video-clip-fails-to-transcode))
    
*   XR: Fixed an issue where custom XR packages would not get registered when running the Unity Editor using the -batchmode argument. ([1334517](https://issuetracker.unity3d.com/issues/xr-sdk-openvr-xr-plug-in-provider-is-not-enabled-when-project-is-ran-in-batch-mode))