Quests are bugging out

After receant server restarts I've noticed that a lot of quests are bugging out, mainly the ones where you have to interact with certain objects or the ones where you use and item on something for example: https://www.wowhead.com/quest=9971/clues-in-the-thicket https://www.wowhead.com/quest=10447/the-final-code https://www.wowhead.com/quest=10021/restoring-the-light and many more do not work. Anyone got any ideas how to fix this ?

We applied a fix today for this issue, please use the bugtracker next time.