Difference between pull --rebase and fetch+rebase

I have a branch configured to track a remote branch by rebasing. I excepted
that "git pull" would therefore be equivalent to fetching from the remote
repository followed by rebasing the remote branch, but it isn't. When doing
"git rebase <remote>/<branch>", it applies only the commits after the merge
base. When doing "git pull", it tries to apply two more commits (the two
commits preceding the merge base). Why is this?

I get the same result even if I do "git pull --rebase <remote> <branch>", it
doesn't seem to have anything to do with incorrect configuration of the
branch.
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