This combined with the ceiling collisions may be what's causing this behavior.
Got a video or the input file of the second bit?
It looks like what is happening is that the game thinks Mario both hit the inside of the wall that represents that section of vertical grating that lines the floor, AND needs to be put on the right side of that wall, but it does the moving first and the collision second.
Maybe this type of order of operations error is related to the glitch?
If I stand right here on any of the platforms, basically at the peak of the triangle, and stand right up against the wall, mario gets into a state where if I jump, I can't move in any direction while in the air. Also mario can't double jump, and does his diving animation while mario is in the air if you hit B.
So why does this happen? Do those small peaks have special properties, like slipperiness?
Here is something else I noticed. If I jump from that position and 2 frames later hit B, I will eventually fall off the platform and collide with something behind me that turns Mario around, any idea what this could be? It seems like its in the same spot where the wall above mario at the top platform is.
Any ideas what is going on here?
I saw some theories about Mario colliding with the peak of the platform above him when he jumps in the glitch video, they do seem to give him some funny properties.
Movie file updated! Do you need more time on any potential improvements, Alyosha?
Question. Why is the "CHIP" bar so high in most levels, when you need to have the entire bit you didn't use depleted by the end?
I don't really understand much about determining when you can do fast bounces on the ground and when you can't. Even in Stage 1, there are some times where you run along the ground, and then there are some times when you can do a bunch of fast little bounces. Why does that happen?
So: [230] SNES The Combatribes "2 players" by Phil, Genisto in 13:08.07 when? Previous: [467] NES Kabuki: Quantum Fighter by nitsuja in 09:20.83
^ How did you figure this out?
I did some testing on how the game decides what ceiling triangle Mario is under.
The result (pictured above) is that it breaks the triangle's down into whole units. In the above picture X is vertical and Y is horizontal, sorry for lack of convention. Anyway solid lines mean that edge is included for mario being under the ceiling tile, and dashed lines mean that edge is not included. At exterior corners, Mario is outside, at interior corners he is inside.
This seam does happen exactly where Mario lands in the video, so I imagine it must be involved somehow.
But this isn't the whole story. It turns out that if I just put Mario under one or the other tiles using MHS, the game updates the tile the next frame. However when Mario is moving, what tile he is under actually lags behind a frame.
As it happens, Mario's speed is extremely small after hitting the wall just before landing. Maybe the combination of all these factors is enough to get an edge case where the game is confused about what tile Mario is under and as a last resort to resolve the conflict ejects him.
Yeah we knew about this months ago before getting public lol
And Mario wasn't even jumping at the time, he was landing.