Most of the current issues are related to YouTube thinking that TizenTube is basically running on a very old TV due to its user agent. Some of these issues include:

• Video segments not showing up
• Long press menu not working
• Video thumbnails being low quality
• Voice search not being available
• and more that's not written here.

All of these issues could be fixed but the problem is, when you change the user agent to be something newer, YouTube changes the CSP (Content Security Policy) to only allow requests to YouTube and nowhere else, which affects SponsorBlock and DeArrow.

Fixing SB and DA is pratically impossible because you can't really bypass CSP. It's a security feature and finding a way to bypass it would be bad news for browsers.