I am fully aware that clipping is not a new concept in this family of games, but this felt unique. I was running through the underground room in 1-2 and threw a ninji against the wall, inadvertently taking damage because it bounced back at me. But when I took damage, I also clipped one tile through the floor. I feel like this could be worth exploring if it has any use, and it does seem different from the other clip methods I've seen (namely, there's no vine involved). Here's a picture of the result: https://photos.app.goo.gl/Z4wCaZG731NnxXEw8

Nice find! It'd be interesting to see what could be done with this if easily replicable. Thank you for sharing!