Update: crash happens when I ctrl-z to undo removing some reinforced concrete tiles while in the BP lab. The tiles were removed via decon planner set to Tiles Only.

I would dig into the log and maybe try to figure it out, but I figure it's just the Blueprints Lab mod throwing a fit. Game was flawless prior. Thanks for being the best devs ever, and remember to take care of yourselves!! I mean it.