Visa stamp from employer A valid, petition revoked

I have a valid visa stamp from employer A in my passport till June 2021, but my petition was revoked by employer A. I have a new approved petition from employer B which is valid till 2023. Is my visa stamp still valid? Do I need to go for new stamp before I travel to US? Will I face any issue at POE if I travel with old stamp? Thanks

Hi Prakash1987,
Hope this message finds you well.
I am currently in the same situation as you.
Company A revoked my visa stamp, but have approval notice (I797) from company B.
I wanted to know whether you were able to pass through POE on the basis of old stamp and new approval notice?

Thanks