Losing reference to C# class when restarting UE4

[Sam-Online]

If you use a C# class in ue4's instanced object (like if I were to make a UAnimNotifyState class in C# and reference it in an AnimSequence or AnimMontage), save and close the editor, next time you open it, the reference is lost, the message log will says something akin to:

Any idea if its something on my end? or a known issue? or an unresolvable issue?

[pixeltris]

I haven't been able to reproduce this. I added a C# defined state to the "Tutorial_Idle" character asset. After reopening the editor the references seem to be there. Could it be that something is forcing your assets to load before C# classes have been fully initialized?

I don't seem to have a "_Part_Data" file, this could also be something to do with it?