Unity

What's new in this version:

Fixes:
- 2D: Fixed issue where when using Safe or Smart slicing caused some sprite rects to become parented or unselectable
- Asset Bundles: Fixed main thread hitching when loading an AssetBundle asynchronously while loading other assets in the
- Asset Import: Fixed issue where FBX and Sketchup files with paths longer than 260 characters could not be imported on Windows
- Asset Import: Fixed issue with OnAssignMaterialModel next methods not being called even when the first one returns a null object
- Build Pipeline: Fixed such that 'Compress Assets on Import' setting no longer gets enabled each time a player is built
- Editor: Fixed to make EditorUtility.DisplayProgressBar visible, even for async/background tasks
- Editor: Fixed to make it possible to alt-tab or click on main Windows Editor window while a modal progress is active
- Editor: Fixed Windows Editor progress bar not displaying progress overlay in the taskbar icon when the progress dialog is focused
- GI: Fixed broken shadow angles for GPU lightmapper
- Graphics: Fixed crash with accessing invalid texture ID
- Graphics: Fixed missing type check from VFX component sheet
- Graphics: Fixed terrain trees showing both baked and realtime shadows when using a static prefab
- IMGUI: Fixed an issue where Editor slowed down when ObjectSelector/ProjectBrowser had a large number of objects
- Kernel: Fixed to improve memory management for storing object information
- macOS: Fixed Mac editor/player hanging the whole OS on Apple silicon devices
- Package Manager: Fixed an error being thrown when inspecting packages in the 'My Assets' section of Package Manager
- Package Manager: Fixed to ensure that at Unity shutdown time, we do not crash if a user keeps sending progress report
- Particles: Fixed an issue where procedural emission was being capped incorrectly leading to burst emission in excess of the Max Particles limit
- Particles: Fixed to limit the rendering cache size to avoid using lots of memory when using multiple cameras
- Serialization: Fixed such that SerializeReference reuses polymorphic instances when changing specific values in the inspector
- Services: Fixed the parameter supplied to the request to enable
- UI Toolkit: Fixed package version numbers flickering while resizing the Package Manager window when the display scaling is above 100%
- Video: Fixed crash with videos that have rotation metadata on Windows
- WebGL: Added support for PVRTC and RG16 textures. Enable use of high-performance WebGL GPU powerPreference
- WebGL: Fixed a crash with Unity web loader on new macOS Big Sur

Changes:
- XR: Updated the Oculus XR Plugin package to 1.6.1

Improvements:
- Editor: Improved mobile ETC/ETC2/EAC texture compression (about 1.4x speedup)