Another bug: saving levels often fails:
It can be consistently reproduced by clicking on a blueprint actor, raising it off the ground, and pressing the END key to snap it back to the ground, and then CTRL-S to save.
Pressing Continue “Apparently” works, but still gives a popup saying the save failed. I always click on something else and save again just to be sure.
Being a “compulsive saver”, this is really annoying! (it happens under other circumstances too, this is just an easy way to reproduce).