Tell me, did you lose your first game in that zen season, and did you win the first few matches of your season 10 placements?
And by the way that thing about the system becoming less sure was confirmed by blizzard, don’t have the source rn tho. I’ll take a look.
Edit:
Not the one I was looking for but might be worth looking at the part under the “skill rating” dropdown.
How competitive skill rating works season 11
Looking further for dat blizz quote ^^ - - > bored/google not being very helpful rn