Engine Crash on property access

Development Programming & Scripting C++
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I have a rather strange issue. When I update my characters blueprint, i.e. change any value at all, the next PIE will crash with an error on property access.
i.e. line 527 of PropertyAccess.cpp seems to not have the value that FieldPath.cpp needs

				check(Indirection.Function->GetReturnProperty() == Indirection.Property.Get());

if I open the characters animation blueprint and do file->refresh all nodes, I won’t crash, no errors or IDE issues.

Has anybody come across this crash on line 527 or if you have any pointers to help me ?

I’m on UE 5.4.4.