I have similar problem. I got my approved I-797 notice on 22nd Feb and it says 1B1 rather than H1B. From what my lawyer told me this Typo error and been happening after 21st of Feb on numerous approval notices. Did you guys consult with your lawyers and what did they say? how long it will take to receive correct petition? since its premium processing does USCIS expedite in sending correct notice.
My Lawyer advised not to travel out of this country using this petition since its very risky.