I love the mod, and I'm glad to see it starting out. THank you. To fly around with a spell called yump that we made of self leap launch slowfall and whatnot. This is going in any modpack of any version I support from here on 'cause it's a lot of fun.

Anyway, Building a small blood magic area and needed to fill in some blocks that were out of reach. Not a problem! I have cobblestone in my inventory and my hotbar is [Sentient sword] [Book] [Signs] [Cobblestone] and it'll ignore the sign. Craft up an extendo arm spell of Projectile - Place Block and rightclick. I expected it to go "we can't place signs from a distance" in the same way it goes "you can't place sentient swords from a distance", Instead the server crashed and I think that's because it tried to open the sign interface.

Is there any other info you would need to replicate this?

Also, upon reloading the server and rejoining, the sign was, infact, placed.

Fixes in 1.10.3, releasing today. Thank you