As you can tell from the update's title, check descriptions have been implemented, in order to help customers better understand how checks and their detections work. You can view them via the Manage-Checks inventory menu.
In regards to the ground teleportation issue, I was unable to find the source, so the left ground utility was left untouched for working perfectly, and the ground teleportation method had its calculations revamped.
Logs:
Corrected a Jesus swimming depth-strider false positive.
Corrected several EntityMove water limit false positives.
Revamped the ground teleportation utility with new calculations.
Possibly corrected an ImpossibleActions tower false positive.
Further optimized the IrregularMovements check.
Implemented check descriptions in the Manage-Checks inventory menu.
Almost completely revamped the Piracy protection.
Removed the IrregularMovements combat detection and its configuration options.
Improved and organised the Lag-Management protection.
Improved the IrregularMovements jump detection.
Corrected an IrregularMovements jump-illegal bypass.