Print String in Behaviour Tree Task shows old class name

Weird, but I have 2 BT Tasks, which show a wrong class name when doing a Print String.

BT Task Name from which I do my print string: BTT_MakePathFindSpline

And in Print String result, wrong name is shown:

LogBlueprintUserMessages: [BTT_SocketToSocket_C_1] blablabla

I did rename Tasks quite some time ago, and it looks like old names are kept somewhere, but the old Task definitely does not exist any more in my content. The tasks are working, but it makes life somewhat difficult in debugging, if wrong names are shown in the log.

I have no idea, how I could clean up this - except for creating new tasks, which might help. There are 2 tasks affected by this problem.

Anyone encountered similar issues?