I have the same issue, progression rewards were Tier 1 card feat every level. Ran out of card feats to unlock, now it's stuck on quest victory without any way to proceed.
https://forums.obsidian.net/topic/90991-stuck-in-quest-victory/
Solution as reported from other thread is to uninstall and reinstall the app, attempting now. With luck I'll be able to shuffle the stuck char's cards over to new chars over a few forfeited quests.