DisableRidingExploitableMobs - dniym/IllegalStack GitHub Wiki
CHILD OPTION OF DisableChestsOnMobs
This option is ENABLED by default, and simply prevents players from riding or taming creatures such as donkeys, llamas, mules to further protect against chest dupes.
To enable / disable this protection use the following command: /istack toggle DisableRidingExploitableMobs
This protection has no extra options.