Is the u.s. cancelling dual citizenship?

Has anyone heard anything about this? There have been posts on social media and voicenotes in group chats being sent out around only using your u.s. passport when traveling, as upon trying to return to the u.s. they are now cancelling your u.s. passport/citizenship if you used your other citizenship's passport to enter that country. It sounds like a hoax, but who knows what's really happening these days...