Season 184 - finished 13th last season but still lost stars

I tanked in season 183 and today found that I’d lost a star anyway.

Is this a new rule change?

I’m ok with whatever Nordeus decides - I can make it work in either tanking or no tanking mode - but I can’t make it work if a rule isn’t announced.

Please let me know. But the developers need to announce the change a season ahead of time.

Sometimes it happens in highest levels.
But what is the worst - you loose stars but you get 1x and no rewards in asso too...