When entering a nether portal, the portal can sometimes apply suffocation damage. This might be due to the fact that the portal spawns you in the middle of it, I do not know exactly. This seems to be happening on all bedrock platforms.
Related issues
Comments
[Mojang] Mega_Spud (Jay)
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-28765, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature, to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki