Sleeping in a bed whilst heading into a portal sends you to the bed coords in the nether.

If you start to sleep in a bed a few seconds before the game actually sends you through to the nether via standing in a nether portal, you get sent to the bed's coordinates in the nether. Showcased here in the first section of the video: https://youtu.be/x3_BrNcH4SQ

EDIT: I had taken a quick glance to see if it was already reported, but I guess I had just skipped over it. Yes, this is a duplicate.