i am making a minigame, i have the "heavy redstone" at 0,0, and the gamefield is at 1000, 0, so the client does not have to load the redstone, well, there are some entities at 1000,0, but when i leave 1000,0, and go to 0,0, when i come back to 1000,0 none of the entityes "can be found", if i try to /execute on any of the entityes, the message is "that entity couldnt be found" and that appies for all the entities (about 70) i also cant use /kill, i cant use any command on them, i must restart the server to be able to use them again (just /stop and reopening makes it all work perfectly fine).

Workarround i am using right now:
detecting if the entities are there, but gliched (testfor with /stats = number of entities,set count count 0 & /execute @e ~ ~ ~ add count count 1, if the /stats says more than 1, but execute says 0 (bcos execute does not work on them), then just summon creepers with fuse:0, (other alternatives are: summon inst damage potions, summon falling sand with HurtEntities:1 and high damage value, or setblock lava if you feel like it, but that's slow))