Also Hilda season 2 dropped in December 2020, though it may be more "kids" and less "speculative fiction" than some of the other stuff you list.

...as did all three seasons of Kipo apparently. (Maybe i should stop posting comments until i actually make it through my "tv watched in 2020" list, but where's the fun in that?

...also (i promise i'm really done after this, at least with TV) the last few episodes of The Good Place s4 seem to have aired in 2020 rather than 2019.