On 1.18, the server is getting spammed with errors like "[14:38:06] [Server thread/ERROR]: Unknown structure start: repurposed_structures:mansion_birch" and warns like "[14:44:53] [Server thread/WARN]: Found reference to unknown structure 'repurposed_structures:mineshaft_nether' in chunk [33, -6], discarding". Log attached for reference
latest.log
.

Did you remove repurposed structures off of the server? Looks like it isn’t running if the game cannot resolve the structure starts

Something like that was indeed the issue. The server did not load fabric or any mods whatsoever and I didn't even notice until much later. Sorry for that.