[2019] Item Spawners disappearing from island

Hi, creator of Vertigo Zone Wars here.

Every time I leave and re-enter a creative server, random item spawners will disappear. Sometimes when I start a server, missing ones will reappear and new ones will vanish. Loading a previous save state does not fix this issue and newly placed item spawners are not safe either. There doesn't seem to be any pattern to this other than some item spawners seem to be immune.

Also, sometimes spawners double up on the same platform. This probably happens because I replaced missing spawners and they're probably both loading in.

Please Epic, help.