upon logging into a multi-player game I have experienced falling through the map until the screen goes white or black.

 

One fix is to have a friend kill you and you will respawn out of this glitch.

 

I have also exited the game to Xbox dashboard and still glitched through the map upon re joining the online server.

if you fall just wait till you're about 500cm down (or more) and then press jump, you can fall for a VERY long time so there is no rush, if you have a dandelion equiped just pop into your inventory and take it off.

 

side note: i have falled about 5000cm before jumping and everything was still fine.

hope this helps.