I've recently added new show and all three seasons for it.
While I was adding season 1 & 2, each new episode correctly made a jump of 7 days ahead for every new episode.
However, starting with season 3 the jump was by 6 instead of 7 days. You can try it.
TV show - https://www.tvmaze.com/shows/56400/bolji-zivot/episodes
See the last episode on June 16th, and if you try to add next one it will jump to June 22nd instead of to June 23rd.
What is weird is that first two seasons jumped by 7 days correctly, only third one started jumping by 6 days so I had to adjust day part of the date on every next episode I was adding.
Not sure what could be causing that on season 3.