When you pal climb on this scaffolding and then stop at the verу eпd, they would boldly kick you to the bottom IF:
1. You climb onto very high scaffolding, about 20 tiles long;

2. There's a bit o' lag (100 ms) present on the server or in your SP world.

And again, you asked for what's more?! Yes, if you playin' on the server, it can kick you from it cuz of 'FLYING IS NOT ENABLED ON THIS SERVER' or just kill you, like with this freaky MC-168488 issue.