Some dungeon quests not shown in map(my list have 3 items: 1951-Rituals of Power, 1956-Power in Uldaman, 2846-Tiara of the Deep ), and alert 'This quest is not in the database'.

First try to fix this => b24806e

WOTLK instances should show the map (only Northen instances have maps in game), rest will maximize Minimap.

Is the instance maps part of this issue (not the quest indicators part) still being worked on?
Or is there anything we could do to help?

No, im not working on this. I dont have that many time... just fixing recent issues. All users are welcome to help. Any one can make pull requests from his github fork of Carbonite :)

Will check that later.

Files for 40-60 level quests are now updated. Download latest version and check again.

Didnt test instances and BG yet.

Normal 40+ quests shown and waypoint works fine. but these in dungeon still alert quest target not in the database.

I think problem is with objectives that are not in database becouse they are not in WoWHead database. All quest data is scrapped from WoWHead.

there is a wowhead addon if you guys would like to gather and contribute to the quests not in the database. its how we did it back in the day.