Runtime.ThrowNSException (System.IntPtr ns_exception)
/Library/Frameworks/Xamarin.iOS.framework/Versions/14.8.0.3/src/Xamarin.iOS/ObjCRuntime/Runtime.cs, line 407
SIGABRT: Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: Modifications to the layout engine must not be performed from a background thread after it has been accessed from the main thread

Runtime.ThrowNSException (System.IntPtr ns_exception) /Library/Frameworks/Xamarin.iOS.framework/Versions/14.8.0.3/src/Xamarin.iOS/ObjCRuntime/Runtime.cs:407
Runtime.throw_ns_exception (System.IntPtr exc) /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/runtime/Delegates.generated.cs:126
(wrapper native-to-managed) ObjCRuntime.Runtime.throw_ns_exception(intptr)
(wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend(intptr,intptr)
CATransaction.Commit () /Library/Frameworks/Xamarin.iOS.framework/Versions/14.8.0.3/src/Xamarin.iOS/CoreAnimation/CATransaction.g.cs:94
CADisplayLinkTicker.StartThread () D:\a\1\s\Xamarin.Forms.Platform.iOS\CADisplayLinkTicker.cs:61
ThreadHelper.ThreadStart_Context (System.Object state) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/thread.cs:74
ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:968
ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:910
ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:899
(wrapper other) System.Object.gsharedvt_out_sig(object&,object&,object&,intptr)
ThreadHelper.ThreadStart () /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/thread.cs:111
(wrapper delegate-invoke) <Module>.invoke_void()
(wrapper managed-to-native) ObjCRuntime.Messaging.void_objc_msgSend(intptr,intptr)
CATransaction.Commit () /Library/Frameworks/Xamarin.iOS.framework/Versions/14.8.0.3/src/Xamarin.iOS/CoreAnimation/CATransaction.g.cs:94
CADisplayLinkTicker.StartThread () D:\a\1\s\Xamarin.Forms.Platform.iOS\CADisplayLinkTicker.cs:61
ThreadHelper.ThreadStart_Context (System.Object state) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/thread.cs:74
ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:968
ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:910
ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:899
(wrapper other) System.Object.gsharedvt_out_sig(object&,object&,object&,intptr)
ThreadHelper.ThreadStart () /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/thread.cs:111
(wrapper delegate-invoke) <Module>.invoke_void()