Modded blocks, items, and entities will not render on the online servers

Whenever I enter any server, all modded blocks, items, and entities won’t render from any distance. I can confirm that it’s just the online servers, because all add-ons and mods work on my other personal worlds. This has been going on for several weeks, too.

The video below shows me entering the Galaxite online server and looking around the world once I load in. My device had a high ping this time around, so all the other players on the server weren’t moving (normally I have a low ping, so I know the problem isn’t my connectivity).