Summary: When going through nether portals (overworld to nether) on realms, you can take suffocation damage while in the loading screen, which takes far longer than normal. Once you have loaded the nether, then you either take no more damage, or are shown the 'you died' screen. Sometimes this can occur without any damage noises.
What happened: I went through a nether portal on a realm, and took suffocation damage, dying. On repeat, this turned out to happen only some of the time. The death message shown was 'T1nyRaccoon suffocated in a wall'.
How to repeat: Go through a nether portal on a realm (possibly only on an iOS device). repeat until damage occurs.
Thanks for your time, T1nyRaccoon
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We continue to see this with a friend who has a slower connection. In one instance, my son and I were playing on our PCs and our friend was coming from the nether to OW and we could see him in the portal, suffocating, while he was still seeing the building terrain screen. He died and dropped everything where we were, and some items ended up in the nether while others were in the OW.
This is definitely preventing him from playing on our Realm with us currently, or when he does play he is forced to stay in the OW dimension for fear he will lose all of his gear by dying in a portal again.
Even with my much faster internet connection, it is still common for me to lose a heart while traveling between dimensions.
Duplicate of MCPE-146959