This same bug (MCPE-115933) happened to me. I went into a existing portal at -600, (approx 60), 4208 in the overworld and ended up in the nether at the same coordinates. Also, there was also no portal created on the nether side.
Bedrock version 1.17.0 on PC
CyberneticGolem
This same bug (MCPE-115933) happened to me. I went into a existing portal at -600, (approx 60), 4208 in the overworld and ended up in the nether at the same coordinates. Also, there was also no portal created on the nether side.
Bedrock version 1.17.0 on PC