to reproduce, place endermen in the effect cloud of water. the enderman wont take damage and the effect cloud wont react to the mob (but will diminish only from "evaporating")
MC-106721
Lingering water bottle effect cloud does not damage endermen and blaze
Resolved
Duplicate
1
This ticket has been marked as a duplicate of MC-MC-106812, in favor of the more general or better information provided.