When going through a Nether Portal (either way) you can randomly get teleported to the same coords but in the other dimension (confirmed on Switch but could be on multiple)
MCPE-124454
Nether Portals
Resolved
Duplicate
0
Robbie Sievwright
(Unassigned)
Unconfirmed
Nintendo Switch
1.16.220
Retrieved
Duplicate MCPE-115933