Just pressing Re-Create on an old world shouldn't automatically convert it, as no world actually gets openned on a newer version. I can see some user accidentally click on Re-Create on an old world that was never supposed to be opened on a new version and have their inventory wiped because of it. Yes, downgrading is NOT supported, but it doesn't mean just clicking Re-Create should automatically convert a world (or at least show a warning screen).

TLDR:

• Clicking "Re-Create" to clone the beta world shouldn't automatically convert it or at least show the warning screen.