Unfortunately, I don't have a recording of the glitches. All testing was done on a single-player survival world on 1.17.32 Minecraft Bedrock Edition. All beta features were disabled.

While recreating Dream's scaffolding MLG trick shots in a survival world I found that I would take zero fall damage if I landed on scaffolding (without pressing shift) up to a certain height where I would then take the appropriate amount of fall damage. I was able to survive lethal falls and walk away with full hearts repeatedly and consistently.

I also discovered that fall damage entirely is broken, where 30% of the time I take no fall damage whatsoever. This is not consistent and varies based on the height of the fall. 

I tested the scaffolding and general fall damage with and without elytra, with no feather falling. I was wearing netherite and diamond armor with enchants. 

Fall damage would on rare occasions be applied to the player twice rapidly. I would take a fall, land, and take the fall damage twice in rapid succession. I was only able to replicate this once or twice within hours of playing single player survival.