Unexpected behaviour with "require password" and screen saver

In 10.6.x, I checked "Require password after sleep or screen saver begins" and after the invoking the screen saver (via a hot corner) moving the mouse or typing on the keyboard brought up a password dialog.
In Lion, this is what happens with the same settings:

That got posted somehow before I finished. Here is what happens:
The log in screen is displayed.
I select an account and log in.
The log in screen is displayed again.
I am logged in, but have obviously been logged out in the meantime.
This looks like a bug to me.

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