When tessellating the UI geometry, it is possible to get an error because a null check is performed on the job thread.
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InvalidOperationException: EnsureRunningOnMainThread can only be called from the main thread
UnityEngine.Object.EnsureRunningOnMainThread () (at <347e9cb990044b19a415d80dc9c7be25>:0)
UnityEngine.Object.GetInstanceID () (at <347e9cb990044b19a415d80dc9c7be25>:0)
UnityEngine.Object.IsNativeObjectAlive (UnityEngine.Object o) (at <347e9cb990044b19a415d80dc9c7be25>:0)
UnityEngine.Object.CompareBaseObjects (UnityEngine.Object lhs, UnityEngine.Object rhs) (at <347e9cb990044b19a415d80dc9c7be25>:0)
UnityEngine.Object.op_Inequality (UnityEngine.Object x, UnityEngine.Object y) (at <347e9cb990044b19a415d80dc9c7be25>:0)
UnityEngine.UIElements.UIR.MeshGenerator+TessellationJob.ApplyInset (UnityEngine.UIElements.MeshBuilderNative+NativeRectParams& rectParams, UnityEngine.Texture tex) (at <6603732cfe894bf1a78f54f7a10a3710>:0)
UnityEngine.UIElements.UIR.MeshGenerator+TessellationJob.DrawRectangle (UnityEngine.UIElements.UnsafeMeshGenerationNode node, UnityEngine.UIElements.MeshBuilderNative+NativeRectParams& rectParams, UnityEngine.Texture tex) (at <6603732cfe894bf1a78f54f7a10a3710>:0)
UnityEngine.UIElements.UIR.MeshGenerator+TessellationJob.Execute (System.Int32 i) (at <6603732cfe894bf1a78f54f7a10a3710>:0)
Unity.Jobs.IJobParallelForExtensions+ParallelForJobStruct`1[T].Execute (T& jobData, System.IntPtr additionalPtr, System.IntPtr bufferRangePatchData, Unity.Jobs.LowLevel.Unsafe.JobRanges& ranges, System.Int32 jobIndex) (at <347e9cb990044b19a415d80dc9c7be25>:0){noformat}