In versions 1.17 and above, invisible item frames can be crafted with a glowing ink sac to create glowing invisible item frames

Completely remove invisible slime capability from the plugin.
If slimes stick around after updating, run "/minecraft:kill @e[type=minecraft:slime]"

Thank you Minestick for reporting

Configuration option to make invisible item frames visible and glowing when they have no item in them.
The glowing slime functionality will be removed in a future update.

The recipe center item is now configurable!
It uses an "exact match" so potion data or other nbt data will be saved in the recipe

There's now a configuration option to enable/disable invisible slimes and a command to recheck slimes for all loaded invisible item frames

Bumped the event priority from NORMAL to HIGHEST which prevents load-order-based fighting for event cancellation

Allows for easy detection of invisible item frames without items

Removed task interval and replaced with individual task timers

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Now you can use the "/iframe" command to get an invisible item frame without crafting it