
Yes! The only stories I’ve read with a satisfactory explanation are those where the original body owner died, the soul left, new soul moved in. But, I’ve read/reading others when a person wakes up as someone else that didn’t die. No explanation at all. I’m curious to see where the author takes this.

I came across a really interesting explanation in a BL light novel recently.
Spoiler! if you plan to read it:
Surprise! The Supposed Talent Show Was Actually–?!
You start off thinking he's transmigrated from the 21st century to the interstellar age in his own body. Glitch in the time stream or something. One minute he's attending an audition for a normal talent show, but then he goes through a door and he's accidentally applies to an interstellar survival show instead.
Turns out, no magic or time stream shenanigans has actually occured.
He's actually a science experimental clone of someone from the 21st century. They found the clones had less mental health problems if they were raised in the environment similar to their genetic memories, so he's spent half of his life in a VR machine. He was either in the machine or getting tests done. So of course, his brain said the machine was the reality and reality was just bad dreams.
When the experimental base was about to go kaplooie from the government pulling the plug and getting rid of the loose ends, the lead scientist set the MC free before he could be destroyed. It just so happened to be in front of the studio where they were auditioning for the survival show and the MC was just following the last scenario from the VR machine. But to him it seemed like a time skip/transmigration.
I thought genetic memory would be super interesting as a transmigration trope. Not just, "a past life", but actual genetic memory of a previous ancestor. Ala Assassin's Creed.

No she existed. Spoiler or what I do not know where is it at the moment on mangago.
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she just died a young age to save Aseph and then was sent to modern world to reincarnate to save her soul, and her original world became a novel in the modern world. But her soul and Asephs was so tightly linked that she even wanted to save him in the novel and thus was then sent back to her original world.
I read it either here or somewhere else and mixed it with this site.
╮( ̄▽ ̄)╭

The spoiler I saw (I tried to back out quick, but I’m pretty sure this is what it said) It’s a big spoiler so read at your own risk.
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The other sister, Zay, did actually exist, but died as a small child. That child transmigrated into the present day Zay which is why she was so drawn to that book. Also, Zay just assumed there wasn’t another sister because it was never mentioned in the book. So, in essence, the present day Zay simply returned to her original world with the exception that she didn’t die as a child.

Surprise! The Supposed Talent Show Was Actually–?!
https://www.novelupdates.com/series/surprise-the-supposed-talent-show-was-actually/
Wow finally a heroine a transmigration plot who has the mind to look into how the hell they ended up there. Will we get an explanation about the transmigration? Or the body switching? Why is it them? Is it just a coincidence? Let's find out together! Hahahahhah