See blackd/Inventory-Profiles#256 (comment)

Thanks for the report! This will be out in the next update.

Cool GUI editor btw!

Here is an example how other mods do it
https://github.com/Crendgrim/AutoHUD/blob/0c10c063cf97c1631d0ff51d17df74596189adce/src/main/java/mod/crend/autohud/compat/mixin/inventoryprofilesnext/LockSlotsHandlerMixin.java