Animated objects rotation is flawed.

Using unity default build it animation tool, i animate object just by rotating, i
get weird U motion like if curves tangents were bent or something like that.
I encountered this behaviour a lot but i never had the need to repair it cuz
we use Usequencer mostly, but now it’s broken and i basicly have no good
working tool to animate objects.

Curves are linear, 2 keys… Still that dumb rotation issue like if object
is gimbal locking when its not.

Ok self answer, the problem seems to happen because unity animator ingores the fact i used only rotation tool on a object and writes positional keyframes too with some values that were never imputed by me, which is obviously a bug and huge flaw.