I am new to the troubleshooting part of mods in Minecraft, but I have tried to turn off available entity culling as I feel as the issue resides on minecrafts end to keep the entity loaded in, and I have asked others for advice but to no avail. What can I do to fix it?

Is your issue related to a specific server or does it happen in singleplayer and multiplayer mode?

It seems to be an anti x-ray protection because the mod will highlight all entities if the server notifies the client to render it.

Which other mods do you use? There may be one that improves performance by only rendering mobs the player can see or spoof.