Alias bug

I think there is a bug in Alias check..

If I create a page with an Alias, let's say bla-bal-1, and then a category with the same alias, bla-bla-1, I can do it. However, when I visit the category, then I receive a 404.
If I decide to update the alias of the page bla-bla-1 to bla-bla-2, then it's fine, I can display the Category.

So it seems Alias must be unique. You can't use the same alias twice if the alias belongs to a page and a category. What I mean is that, even if it makes sense, the system should prevent you to use twice the same alias. The check is not working.

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