Surtr Itemsadder's placed furniture partially disappeared after several refreshes of the material pack (/iazip command), leaving only the barrier squares behind, and I had this problem many times, which forced me to reposition the configured furniture.
ItzASecretBoi Surtr Volunteer Here! I'm not sure what could cause this issue, maybe @LoneDev can help? In the meantime, do you have any errors or client log errors you can report?
Surtr ItzASecretBoi Thank you, I noticed that there seems to be no error reported in the background and only some of the furniture has turned into barrier squares, which is so strange.
LoneDev Partially disappeared after several refreshes of the material pack (/iazip command) I'm 101% sure this is not caused by ItemsAdder since I don't delete any entity from time to time or when using /iazip command. You have a plugin or a command block which is deleting entities. Or some player is removing them.