Gitlab rebase truncates commit messages to exactly 10240 bytes

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When using Gitlab to rebase a merge request it truncates rebased commit messages to exactly 10240 bytes. I first discovered this on GNOME's Gitlab instance and reported it there:
https://gitlab.gnome.org/Infrastructure/Infrastructure/-/issues/2041

I have also re-produced the issue in Gitlab's own instance.

1. Merge request.
   mfleetwo/test!1
2. Submitted commit message before rebase. Message is greater than 10240 bytes.
   mfleetwo/test!1 (67ac5355)
3. After rebasing the commit message has been truncated to exactly 10240 bytes.
   mfleetwo/test!1 (6044017a)