I think I found what triggered this issue. For me it happened only when I teleport myself between two loadable chunk (other than the spawn).So you can fix your map by teleporting the player to the spawn, and then to the arena.
ok thanks
In the previous versions it works but ...
I think I found what triggered this issue. For me it happened only when I teleport myself between two loadable chunk (other than the spawn).
So you can fix your map by teleporting the player to the spawn, and then to the arena.