Variable default value set to PLACEHOLDER-CLASS

After restarting the editor, the default value my variable ‘Projectile’ gets set to PLACEHOLDER-CLASS:

The dropdown menu for the default value does not show any of the blueprints from the BP Base Projectile class. As a workaround I have to delete the variable and recreate it, but that only lasts till I restart the editor. I also tried deleting all involved blueprints and remaking them from scratch, which worked for a few days, but now it’s back… This whole problem comes with a handled error, which you can see in [this log][2].

Additionally, I just noticed that the checkboxes ‘Replicates’ and ‘Replicate Movement’ become unticked when restarting.