I lost 2 star ranks for not playing in a month from 9 to 7 in Wild, literally played 0 games. I contacted support and was linked to this FAQ: FAQ: Ranked Mode Overhaul Matchmaking which states:
" Q: If I missed one season, will I lose my star bonuses when I return?
A: No, you won’t."
Which only confirmed an issue. They said they looked into it and there were no bugs. I pointed out again it said I shouldn’t lose any so there’s still a problem somewhere and was told to make a topic here. Not that it’ll help.