Issues
OnRep OldValue
When using OldValue in OnRep_ functions, be sure to make your parameter a reference, otherwise your value will be broken.
Example:
// broken
UFUNCTION() void OnRep_HidingActor(TWeakObjectPtr<ATFCInGameCharacter> OldVal);
// works
UFUNCTION() void OnRep_HidingActor(TWeakObjectPtr<ATFCInGameCharacter>& OldVal);`