I-94 expired due to passport expiration - what is my current status?

[pragshri]

Timeline

1. Current I-797 valid until April 2022
2. Current I-94 cut short to July 2021 (due to passport expiry) at port of entry
3. Filed for H4 extension after 3 months of I-94 expiration(on Nov-04) with Nunc Pro Tunc
4. New I-797 and I-94 approved with validity start date April 2022
5. Break/gap in I-94 from aug 2021 - march 2022.

Question : 

1. Is my current stay legal or not?
2. Is there a way I can update my I-94 to accommodate the gap(aug 2021 - march 2022)? or do I even have to?
3. What does start date mean on I-94(attached to I-797)?

Anyone in the same boat, please share your experience.

PS - I do not have valid stamped VISA (it expired in Dec-2020)

[pontevecchio]

The fact that you got a new I94 is proof indeed that the USCIS has decided to ignore the gap and you are absolutely legal to stay. It would seem to be some function of their software that does not allow backdating and uses the day of approval.