They have confirmed that they will shoot at least 17, they already shot most of episode 1 so that makes the season going to have at least 18, and if they are able to they will shoot more.
If there is 17 episodes, not only will it stop the storyline from dragging, but it could probably increase the budget, meaning better CGI. Not like it matters. I’m not picky.
Most likely 17 including 6x20 6x21 6x22 and have 14 episodes but i think they are gonna cram 6x21 and 6x22 to one episode so 15 episodes with a new big bad but if covid goes away maybe we can hit 22 episodes