Holograms disappear after short distance; do not respawn

[Othynrix]

I am using the holograms plugin in a modded Minecraft Sponge server. (1.12.2, latest Sponge release)

Holograms works fine, but some seem to disappear after moving only a short distance away (<20 blocks). It isn't like the armor stands are despawning, if I fly away and fly back, most of them come back just fine.

Replacing them seems to be a nonissue. It doesn't appear to be some hard-coded limit, as I can spawn in many holograms without them despawning immediately or old ones despawning.

Rejoining will make them reappear until I move a small distance away or turn my back on them, where they go on to disappear.

[randombyte-developer]

Try a fresh Sponge server with only Sponge and Holograms. If that works, one of the mods is at fault.