Unknownreported this bug
CustomDurability does not work on armor items, unsure if this affects other items that use durability. Tried setting the value both above and below the default of an iron helmet, and the durability was not affected. Running Paper 1.17.1 Java 17. Running Crucible version 1.4.0 and MythicMobs 5.1.0. My item config is as follows:[Legacy attachment omitted]