[Treasures of Ardenweald] Bug

One of part for get credit on this achievemement its called Enchanted dreamcatcher chest.
And its phasing out when you go closer to it.

Things I’ve tried:

Check it with Warmode on
Check it with Warmode off
Disable all my addons
Relog right on chest
Waiting for an hour there
Partying with someone who can see it

Nothing helped.

It appears that the “Spriggan Riot” World Quest can phase the area and cause this.

If that World Quest is active then complete it and see if that resolves the issue.
If the problem continues after that then please submit a bug report in-game so the issue can be investigated.