We have a blueprint that has somehow lost its parent class.
Some time ago we did do some moving of blueprints, including the old parent class and fixed up the redirectors. We didn’t notice anything wrong at the time but clearly this one blueprint somehow did not get fixed up correctly.
It’s now impossible to re-parent this blueprint and recreating the blueprint from memory is not really an acceptable solution either. I’m having to do some Source Control shenanigans to fix up this blueprint.