When removing items from pit kiln (one clay vessel of 1000+ units of copper and one vessel of ~300 units of bismuth bronze), game freezes for a few seconds then crashes. After crash, world cannot be reopened without crashing a few seconds later.

Crash report 1:
crash-2019-09-18_07.47.56-server.txt

Crash after attempting to open world again:
crash-2019-09-18_07.49.20-server.txt

Latest TFC build, only additional mods are jei, hwyla, journeymap, RTG, and craftstudioAPI.

Seems to be a duplicate of #426. It seems to be an issue with ceramic vessels created in older versions. There may be a proper way to resolve this but for now the fix is to create a new world.