So the standard hopper unloader system isn't working in 1.16/1.16.1 multiplayer.

The minecart hopper just zooms on by right over the hoppers and keeps going instead of the comparator detecting it quick enough to stop the rail as the minecart passes by over it.

This unloader is working in single player, not multiplayer.

https://www.youtube.com/watch?v=t-cWqvP8rw0

This design has worked for nearly 7 years. The video shows what should happen. 

Atm it's acting like nothings there and just bounces back into the rail way before unloading the items.

I've tested 3 or 4 different unloaders to no avail,.. its just wont detect items from the minecart hopper in time for it to output any signal.

Very important for servers, especially to keep lag down. The only alternative is to use tons upon tons of hoppers until this is patched.