History is not preserved?

[donquixote]

Hello,
on a manual subtree split, a branch is generated that contains an equivalent of all the commits that changed code in that directory.
When I use this github action, this same history is not preserved.
Is this by intention? Is there a way to make it behave more like a true subtree split?

(It seems symfony/symfony does it in a way that preserves history, but I was not able to find the mechanism that does it)