I've known of this for a little while but never got any video of it.
What I believe is essentially happening is a near frameperfect (under 10 frames) approach on a blocks first pixel on either side which the block being landed on considers you to be perfectly level with it and not falling on to it.
These breakable blocks can be walked upon freely but if you land on them from a falling state they will crumble.
Here's another example of an odd property of the crumbling blocks if you land on the corner or just below the corner on the left/right side of a crumbling block it will crumble allowing you to land on the block below it without breaking the block you landed on.
The first behaviour happened to me once. I believe it's pixel perfect. The only place in the run i think it's really useful is here:
but it would need combining the green beam glitch with this pixel perfect trick making it quite difficult. (But also quite rewarding)
The second behaviour can be seen in ghuia former any% run at 0:53
I tried to see if it could be exploited anywhere else in order to break block before having the gauss gun but i didn't succeed.
