Ok so I made sure I have the most recent update and there are still two things broken (well, one may be not, but it was still janky on my playthrough).
First, the slide in Black Oasis keeps killing me, I have no idea how it's supposed to be handled and how other people do it. I placed a warp to progress, something I already did on an earlier playthrough.
Next, I swear I killed all goombas in Under Construction, yet the event didn't activate. This was probably a weird 1-time occasion, but still, I'd say there's no harm with removing the quest altogether. The lore can even stay.
Also the homing parakoopa stop challenge is still too long and koopas still spawn too quickly. Isn't it great when you spinjump multiple times and don't hit any of them?
Also, for reasons given
here, please remove the 2.01 from the title. You may also want to go through the levels with multipoints and replace the coded ones with normal checkpoints, so "deprecated" messages don't show up.