Not all WQs are displayed. The "Emerald Dream" area is not listed if I deactivate the "Only show WQ for the current zone" function. When I activate the function, they are also displayed.

Okay, that is a strange issue.
I can reproduce it on my installation, and I have an idea on what is wrong.
It might be a few days before I can get time to fix it though.

I found the issue - the problem is that when filtering is not set to the current zone, the C_TaskQuest.GetQuestsForPlayerByMapID function is called with the Dragonflight main zone id - and that doesn't return quests for neither The Emerald Dream or Zaralek Cavern.
So I have made a workaround, which solves the problem.