Cross-posting my question here since it's kind of an edge case:
My wife has an expired green card with a I-797 (NOA) giving a 2-year extension of green card validity for work and travel (issued by USCIS due to I-751 processing delays).
There are quite a few countries that will allow visa-exempt travel if you hold lawful permanent residence in the US or if you hold a valid US visa (Mexico, for example). However, in many cases the countries will not accept the paper I-797 as "proof of valid permanent residence," (since the physical residence permit [green card] shows an expired date) so she has to go through the standard visa application processes.
My question: She also has a US visitor visa (B1/B2) in her passport from when we were dating that is not expired. Is this visitor visa still considered "valid" for use/entry into other (non-US) countries? The State Department website on visitor visas says "Unless canceled or revoked, a visa is valid until its expiration date."
A few examples of countries that allow visa-free travel if you have a valid US visitor visa are shown here.
If it's relevant, she got a K-1 visa, moved to the US, filed for AOS, got a conditional GC, then filed for Removal of Conditions. I don't think that the Visitor Visa is formally canceled or revoked as part of any of these processes.
I know she can't travel into the US on the visitor visa (she'd use her green card + I-797), but I think the US visitor visa is still valid from the perspective of other countries? Hoping someone else has had some experience with this...