I'm running a small multiplayer server with fabric 0.18.1 on 1.21.11, and after moving from 2.4.3 to 2.4.5, the server gets stuck for a few seconds and spits out this error, and it happens every few minutes.
[DH-World Gen Thread[5]/ERROR]: Unable to close Phantom Array, error: [Null phantom checkout, object is being closed multiple times.].
followed by an extremely long list of error description, and then this.
[DH-World Gen Thread[2]/WARN]: Couldn't find template pool reference: minecraft:trial_chambers/spawner/obsidian_base
FAQ didnt really give me a good idea where to go looking for a solution or what I need to change to fix it. Not sure what other information I would need to provide if its needed, lmk