I have a skybase in my SMP world. It is built out of slab floors and has a nether portal on it. 75 percent of the time I go through the portal, I spawn a few blocks under it and fall to my death.
https://youtu.be/3yAkf4n5Rbs
note: the last part of the video with gameplay is slowed down.
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I put an extra platform under it so I don’t fall and as far as I know, if the blocks under the portal are full blocks you don’t fall so you only fall if there are slabs under the portal frame. This is a realm world.

I have also encountered this issue on my realm on PC bedrock edition.
Could you provide a copy of the world for investigation?