Reproduction steps:
1. Open the “Test” project
2. Open the “Assets/InstantiateAsyncCopy/.unity” Scene
3. Enter the Play Mode
4. Wait for a few seconds
5. Exit the Play Mode
6. Immediately enter the Play Mode
7. Observe the Editor

Expected result: The Editor enters the Play Mode
Actual result: The Editor crashes

Reproducible with: 6000.0.25f1, 6000.1.0a3
Could not test with: 2021.3.45f1, 2022.3.52f1 (Multiple compilation errors)

Reproducible on: MacOS 14.6.1 Intel, Windows 11 (user’s)
Not reproducible on: No other environment tested

Workaround: Do not enter the Play Mode immediately after exiting it

Note: "MissingReferenceException: The object of type 'AsyncDemo.InstantiateAsyncCopy' has been destroyed but you are still trying to access it” error is thrown infinitely after exiting the Play Mode and does not stop until you enter the Play Mode again

First few lines of the stack trace (Windows):

{noformat}0x00007FF80C388363 (Unity) Object::SetCachedScriptingObject
0x00007FF80C389555 (Unity) delete_object_internal_incomplete_integration
0x00007FF80C4D873F (Unity) InstantiateAsyncObjectsData::IntegrateInMainThread
0x00007FF80C4D49BF (Unity) AsyncInstantiateOperation::IntegrateInMainThread
0x00007FF80C4D4532 (Unity) `InitializeAsyncInstantiateOperation'::`2'::EarlyUpdateUpdateAsyncInstantiateRegistrator::Forward{noformat}

First few lines of the stack trace (MacOS):

{noformat}#0 0x0000010d8a4d24 in Scripting::SetCachedPtrOnScriptingWrapper(ScriptingObjectPtr, Object)
#1 0x0000010d035cf0 in Object::SetCachedScriptingObject(ScriptingObjectPtr)
#2 0x0000010d037a85 in delete_object_internal_incomplete_integration(Object)
#3 0x0000010d1b998b in InstantiateAsyncObjectsData::CancelAndCleanupInMainThread()
#4 0x0000010d1b9adb in InstantiateAsyncObjectsData::IntegrateInMainThread(){noformat}