com.unity.xr.arkit 2.1.9 Package Notes

Previously, when starting an AR session with focus mode set to "Fixed", the iOS device behaved as though auto focus was enabled. Now, the device correctly respects the focus mode.
Apps that optionally use ARKit on 32-bit iOS devices now run as expected without AR functionality.
Fixed a crash that could occur when multithreaded rendering was enabled and Stop was called on the `XRCameraSubsystem`. In ARFoundation, this happens when the `ARCameraManager` is disabled. This happened because the textures owned by the subsystem are later manipulated on the render thread, and stopping the subsystem could invalidate the textures.

If you receive this error:
> We were unable to create an instance of the requested type UnityEngine.XR.ARKit.ARKitLoader. Please make sure that all packages are updated to support this version of XR Plug-In Management. See the Unity documentation for XR Plug-In Management for information on resolving this issue.
It means you need to update to at least version 2.1.8 of the ARKit XR Plugin package.

com.unity.xr.arkit 2.1.9