Flan mod: https://legacy.curseforge.com/minecraft/mc-mods/flan-forge

1. Tweak: Double Door Opening: In general, there is a problem that tweak: double door opening does not work as it should, if I open a double door in a foreign region, then one door opens and the other does not. Logically, doors should not open.

Quark already has some Flan integration, so this sounds more like:

• a bug with the double door module. Which is weird, because the double door module does already look at claims. maybe it's a client/server desync or something?
• the Flan integration is not loading on quark's end, for whatever reason.