Neoforge 1.21.1 domum-ornamentum-1.0.221-snapshot-main.jar
Crash report: https://gnomebot.dev/paste/mclogs/hPAlGfe

When placing blocks in table the game hangs and then crashes in both multiplayer and single player.
Does not result in server crash

It's probably one of the installed mods that alters some of the default structures. Could you try without any of the mods if the same thing happens or a binary search to find out which one causes this?