I am not sure if I can reproduce it. But as I remember i had a class with UFUNCTION returning array of USTRUCTs. And Used this class in HUD Blueprint. Called array returning function and had a ForeEach for it. Than I changed some flags on USTRUCT, Added BlueprintType I think, and added BleuprintReadOnly flags to struct fields. After hotreloading that changes bug occured.
I’ll try to reproduce it later. But now is a little bit busy.