Bugfix - please update if you're running IllegalStack ver 2.9.12
1) Disables the UncraftablePotion protection in 1.20 & 1.21 as there is an issue with this protection which causes console spam, we're working on a fix.
2) Fixed a bug that was preventing some protections from being properly enabled, please check your config.yml or browse the status of protections with /istack prot after updating to verify all settings are as they should be for your particular server.