Two bugs were fixed in this update. The first was an issue with swiftsneak not getting removed properly if the player was in survival and using /swiftsneak, the other was an issue causing the plugin to not load on any server on a version lower than 1.19.
Ive also elected to drop support for old versions of minecraft mostly because according to the bstats page no one was using it on any of those versions and it makes a few things easier on me to remove support for them.