Auto saved page revisions show the wrong user

[MungoBBQ]

For some reason, the latest auto-saved page revision is constantly being shown as another user than the user who actually was editing the page during the auto-save.

I can not quite figure out why WP thinks this particular user is the one auto-saving, but it's always the same "wrong" user showing up.

The "wrong" user is a previous editor of the same page, but often 5-10 revisions and several months ago.

The actual manually saved revisions all show the correct user.

Just did some checking up, and the post revision is saved to the database with post_author ID of the "wrong" author (ID: 5 in my case) whereas the correct author ID is 2.

The page edit form seems to contain the correct data however:

<input id="post_author" name="post_author" value="2" type="hidden">

... so the mixup must occur somewhere else. Anybody have an insight to where I should start looking?

(In [11840]) Use the current user as author for autosave, fixes #10004