Minecraft version: 1.20.1
Modloader: Forge
Forge version: 47.1.43
Environment: Singleplayer "Working" / Multiplayer "Not Working"

Mod name: Double Doors
Mod version: 5.0

Hello, I just downloaded the mod and it's working fine on a single player server. but in both realms and multiplayer it isn't functioning at least for me.
how do I get this fixed?

in case of incompitibality, here is my
Modslist:

Balm
Better Third Person
Better F3
Borderless Window
Cloth Confing v10 API
Collective 6.65
Crafting Tweaks
Double Doors
Equipment Compare
Forge
Iceberg
NotEnoughAnimations
ShulkerBox
Spyglass Improvements
Tiny Item Animations
WaveyCapes

I also have a feature suggestion for the Fence Doors:
if we place 2 doors next to each others, could you make them become as "One 2 blocks door" and get the middle piece to disappear visually? or at least as a visual option where the middle pieces all visually disappear and the side ones still appear.

Kind Regards

The problem here is that the mod has to be installed on the server for it to work. It's not client-side only, since it modifies block states. Thanks for giving it a try!