Conventional commits does not specify the revert commit. See: https://github.com/conventional-commits/conventionalcommits.org/issues/88

They recommend using a revert type as it matches the current spec but do not force it. This is kind of fine if you use git on command line since by default git revert lets you edit the commit message. However many people are using Git UI tools which do not allow editing the message right away when reverting a commit and the tool uses the default git message which is

Revert "fix(core): some text"

This reverts commit <hash>

Asking developers to manually change the message from Revert "fix(core): some text" to revert: fix(core): some text just to satisfy the spec could feel like useless extra work, as the default git behavior is already pretty good. Especially in UI tools it requires some extra clicks to do so.

So I think OneDev should always allow the default git revert message for simplicity and good out of the box behavior.