reformatting comments

Hi,
Can someone explain this behaviour?

vim -u NONE -N --cmd ':set comments=e:%% tw=20' -c 'call setline(1, "%%
".repeat("foobar ", 10))' -c 'norm! Vgq'

Output:
,----
| %% foobar foobar foobar foobar foobar foobar foobar foobar foobar foobar
`----
Note: not reformated to fit into the textwidth

Expected Output:
,----
| %% foobar foobar
| %% foobar foobar
| %% foobar foobar
| %% foobar foobar
| %% foobar foobar
`----
(Reformated to fit into textwidth, the comment leader might be left
away)

Is this a bug or a documentation inconsistency or even expected
behaviour?

I just noticed this in a latex document when I tried to reformat
overlong lines and comments starting with %% were not reformatted.

Perhaps the 'eO:%%' needs to be removed from the comments setting?

Best,
Christian
--
Der edlere Mensch verschlimmert sich mehr durch das Unterlassen guter
Menschen (Freunde) als das Unternehmen böser.
-- Jean Paul

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