When there is more than one ep. per day, the prev/next navigation acting funky.
E.g. https://www.tvmaze.com/episodes/1552594/friheden-1x03-somethings-rotten
"Next ep." leads to ep. 5, skipping ep. 4.
https://www.tvmaze.com/episodes/1552596/friheden-1x05-the-childs-first-sick-day
No "Next ep." button at all, yet there are 5 more episodes. "Previous ep." button leads to ep. 10.
The situation above is very inconsistent and confusing.
For example, the same episode before edit https://i.imgur.com/9yJF026.jpg, and after https://i.imgur.com/bQulT4d.jpg
Note, that this is the last episode, and yet it shows "Next ep." button.
After I updated summaries for all episodes, the navigation returned to normal. But there's definitely something going on, because I've noticed it on two different shows.