current_user_can and scheduled posts

Can someone confirm this behaviour for me:

If I have a hook on publish_post which does some things to the post, and that code has a current_user_can check then it works fine when the user is posting immediately.

If however they schedule the post then the current_user_can check in my code block fails.

It would seem that when posts are scheduled WP looses the user_ID context – which I can see in a way because they aren’t actually publishing it but…….