H1-B multiple transfer during lay off

Hello,

My department got wiped out at my current organization that holds my H1-B Visa. I am in my 60 days grace period. Now, I initiated my transfer with future employer A in premium and started working after the receipt notice was received, in the meantime another employer B filed my H1-B transfer in premium,

I have two questions -

  1. Do Employer B need to wait for employer A transfer approval?

  2. Can I start working with Employer B despite I joined employer A on receipt notice?

Please advise.