Just reporting to the DEV know is a major problem.

I don't have the Seal, and only have this Quest on mission board. 30h + of game play to discover is a bug that occours on 4h gameplay If you don't do Quests in the right order.

Should i restart the game? But what If have other bug?

Hello @Coswosk
We worked on this issue and the new Patch will now fix this issue.
It's already out on PC and is meant to release quite soon on PS4. We will post about it on our social medias the moment it's out.