(I'm the user he's talking about)
I'm pretty sure the blueprint book I tried to delete both times was The Complete Belt Series: Yellow, Part 1 but I could be remembering wrong

I'm ngl. I just did my best making this bug report. The owner of the server made a better version of the report

viewtopic.php?f=7&t=70158

I hopped on a multiplayer server i used to frequent to steal their blueprint books. I was messing around for a while then decided one of the unloaded blueprint books that I had in my personal "saved books" thing was useless to me and decided to delete it.
The server I was on immediately stopped ...