I94 back dated after approval of Concurrent H1B

[h1buddy2]

Hi, I got a full time position with employer A and joined employer A after getting the H1B transfer approved. The petition was approved till June 2025 (both I797 and I94 shows expiry as June 2025). My previous employer B, who is a consulting company applied for Concurrent H1B after my petition with employer A is approved. Now the concurrent H1B is approved till Aug 2023 (I797). Even the I-94 on concurrent H1B is valid till Aug 2023. I94 record number on both I797s (both primary and concurrent) are same.

1. Should both my employers file an extension before Aug 2023?
2. If I do not want to continue with employer B, should employer A still need to file an extension before Aug 2023?
3. If employer B files an extension and not employer A, can I still continue with employer A as I797 of employer A is valid till June 2025?

[pontevecchio]

Does A know about the job with B?

In any case each petition stands on its own.