The main part which should have given me some thought was: "[16:09:08] [Server thread/WARN]: Wrong location! EntityBat['Bat'/80227, l='Dis', x=396.05, y=42.61, z=-173.19] (at 24, -11 instead of 24, -26)" followed by a lot of I/O spam.
After a power failure, the coordinates of one chunk got...