[1.21.1] Hanging Sign Tile Entities Error on Servers

[Noobulus]

Whenever a player interacts with a Gardens of the Dead hanging sign on a server, the log reports that there is an invalid block entity at the position of the sign. Breaking these signs is also inconsistent and will frequently result in a ghost block being left behind that cannot be removed. Colliding with one of these signs with Amendments installed will prevent the player from rejoining until the sign is removed, but without Amendments the error still appears in the log but the player is not prevented from rejoining.

2024-10-26-1.log

[Noobulus]

I haven't managed to reproduce this in singleplayer, so it's likely some server-specific issue.