Goes through portal, suffocates and loses stuff whilst still on the loading terrain screen. Old bug says is fixed but happened to my friend. Very annoying for him.
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Had 2 more occurrences. First was on a secondary player on Xbox multiplayer. As the main account, I noticed in time and saved and logged out. When we logged back in, the player was alive and then successfully able to pass through the nether portal.
During the second occurrence, the player was remote logged in using a Win10 laptop, didn’t notice in time, and died with maxed netherite weapons, tools, and armor. Then multiple players died checking the possible coordinates where the portal could have glitched to see if the gear showed up.
This bug has cost us two sets of netherite gear. To compensate, I’ve switched to creative to recover all the losses due to this bug and others. Bummer, as it’s quite a large and developed world. All the advancements now freeze and I’ll have to start a new world to complete the remaining advancements.

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So I’m having this issue on my realms repeatedly and it’s nice to know that the issue is literal years old and isn’t fixed. Just great.
This has been happening to us recently. Xbox One, rev 1.18. 4-5 players. Usually one player joins by Win10 laptop over Xbox live, the others are local console multiplayers. 2 players have suffocated in the portals. We heard that often the person is transported randomly to the incorrect coordinates on either the overworld or nether.
One one occurrence, we went hunting for the gear in the nether after looking in the overworld. We found the experience orb, but the gear seemed to have despawned. One player was close enough to the drop spot without realizing and probably allowed the countdown to occur.
The second occurrence, we were faster in looking in the location in the overworld and the nether. No one was close to allow despawning. We could not find the gear anywhere.
The third occurrence, the person logged out of the world prior to dying. They logged back in after a minute and they were able to pass through the portal successfully. They did have damage from the suffocation. This person was using the Win10 laptop.
doesn’t seem to happen to the main account person. Only the multiplayers who join.