Bugfix:
1) Fixed a bug for real for real this time, that would prevent items in the groupstack list from being properly detected in all instances.
New Feature:
Prevents the no-rocket unlimited elytra boost glitch. This glitch is painfully easy to do and allows players to ascend to insane heights above the build limit,only limited by the number of elytra they can carry!
https://github.com/dniym/IllegalStack/wiki/PreventInfiniteElytraFlight
Video:
Also added 2 new configurable messages to messages.yml for this exploit.
Code (Text):
GlideActivateMaxBuild - Prevented ~name~ from activating an elytra while above the max build height. @
GlideAboveMaxBuild - Player ~name~ was using an elytra above the max build height, disabling glide. @