Bug: Mob spawners stop workinh when I go away from spawners and stop working

Enter a brief description of what is broken Mob spawners stop workinh when I go away from spawners and stop working

What version of Minecraft are you using?
1.13

What server jar are you using? Spigot

What is this a bug report for? MythicMobs

What version of the plugin are you using? Normal

Describe the bug. Be as specific as possible, images or short gifs/videos are welcome but save configuration files for later sections. Write a whole paragraph if needed, help us bug testers replicate your issue!
I put an spawner it is working perfectly but a while later when I go away from spawner and came back spawner stop working and if I use ''mm mob killall'' spawner start working again I am almost sure it is a bug I try to find solution for this from discord and they send me here. (sorry for bad english.

Example Configurations