Save as a new entry doesn't seem to copy all locales I have a website with 2 locales set up, and have an entry that has content in both.

When I Save as a new entry, Craft only saves the locale that is open at the time, and then copies that same content to the other locale, instead of copying the original localised content.

So I end up having one entry with the same content on both locales, instead of having an exact copy of the previous entry (with different content in the 2 locales)

Is this a bug, a normal behaviour or am I doing something wrong?
This is a known Craft 2 issue that has been fixed in the upcoming Craft 3 release.

It likely won't be back-ported to Craft 2 since it takes advantage of much larger refactorings.