(Bug?) ConstructorHelper causes crash

I wanted to use the ConstructorHelper Classfinder to find a BP class that is based on another BP which derives from my c++ created class but this causes a crash. I can find any BP that is directly based on my c++ class. When restarting the editor after the crash it gets stuck while loading on 71% until I delete the asset i tried to find.

Is this a bug or am I using it the wrong way?

Hello,

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Thanks