AdminBug reports 23Suggestions 4Exploits 0
Confirmed and fixed - and your comment about the right wall was the useful half.
Wall collision asks the foothold tree for the platform below your feet and then walks the wall chain from it. When there is NOTHING below your feet - i.e. you are over a pit - it returned early and did no wall check at all. So walls went soft in exactly the situation where you are most likely to be flying at one: jumping off the top platform across open air. It now falls back to the flat wall scan, which needs no platform underfoot.
(On the dev branch - it will be in the next published build, not v32.)