If we reconnect the individual flat server, effects that applied to mob except player are sometimes disappeared.
Expect to fix )
1 ) Although reconnecting the individual flat server, we wish that effects that applied to mob last.
Way to confirm this bug,
1 ) Open the individual flat server
2 ) Enter "/summon horse(or other mobs)"
3 ) Enter "/effect give @e[type=horse(or other mobs),sort=nearest,limit=1] resistance 100000 255 true"
4 ) Let the mob be damaged, and you can see the resistance effect apply to it.
5 ) Exit and Reconnect the server and Let the mob be damaged, and you can see the resistance effect disappeared. (Sometimes)
Can't reproduce in 23w43b. Entities are properly keeping their effects when I disconnect and reconnect from a server.
Are you still able to reproduce this yourself? If so; a video of this occuring would be very helpful to attach to the issue.