Not sure it's just on realm or the whole Bedrock but While you're teleporting to nether, at the last second if you immediately sleep on a bed(make sure it's night or thunderstrom), and if you're on bed and immediately teleport to nether it'll teleport you to at a random location no new portal generates and everytime you do this you'll teleport to the same location.

It's easy to do if you're a bit high on pings so due to latency both things will happen