Thread:Project:Support desk/Protection creates new Revision

Hello, is it normal, that when I protect an article for some time, the protection and the unprotection creates a new revision of the article?

If it's normal, is there a way that the revision-id is preserved? I try to write an extension, and there is a step after a user triggered an action the article get's protected until another trigger. But i would like to keep the revision-id.

Thanks a lot.