Tag editing on the mobile app has become impossible.

If you select the edit, you can click on the 1st or 2nd tag on the left to delete them, but you cannot scroll to the right if they are more tags to see them.

It has also becoming impossible to insert a tag instead, you have to exit the edit and select the Ad tag option in the bookmark menu

I don’t recall when those changes were made, but in early versions, it was much more useful.