When fluidsBreakRedstone is set to false, it is possible to trigger liquid update even if blockplaceevent is cancelled.
To replicate:
Install FactionsUUID, claim some land (I assume any protection plugin will work)
Place some water in claimed land and manipulate flow, manipulate water flow, remove blocks... similar situation as with regens
The part where it starts bugging...
Go to another account, go to claimed land, try to place redstone torch next to those liquids, it will reset liquid source even tho redstone torch placement is cancelled.
When fluidsBreakRedstone is set to false, it is possible to trigger liquid update even if blockplaceevent is cancelled.
To replicate:
The part where it starts bugging...