hmmm... you seem to jump higher now? Not sure if developer(s) submitted a fix, but maybe you're supposed to hold down jump for longer? Can't remember what I did, but your jumps seem way longer than mine. Also is "wall jumping" a thing here? wasn't clear to me.
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I feel like there might be some collider logic that isn't working properly. I'm jumping a second time when hitting a different collider, even if coming from under. On the 4 level, I'm really not sure how I double jump tho, but it seem to work when doing it right at the crack between the 2 platforms.
But I wouldn't say it's a bug, it's a feature that speed runner can exploit :P