Bug when section locked?

see also my posting on "readers"

When you have the following settings
Visibility restricted to associates, editors and readers
Articles posted here are NOT displayed at the parent section page
Articles posted here are NOT displayed at the front page
Editors: AMS
New posts are not allowed here

with

Locked Yes - Only associates and editors can modify content

Then the user AMS can still create new sub-sections. This looks like a bug.
Creating new pages/polls is effectively forbidden.

Cheers

Jan