1.0 release means going from "we hope this works, but if not, be patient because we're still working on it and let us know so we can try to fix it" to "we're pretty confident this works as intended well enough to make it an official feature with announcements and PR."

This goes for all software.

It's weird to call it misleading. Yes, it might have worked, but it was a testing relationship, not an official one.