I have got an Request for evidence on H1-B visaTransfer

I recently got my H-1B Visa stamped for company A ( Had got an RFE the first time and also a 221 G) but it all got cleared and visa stamping was done, now i have switched to another company B they filled for my new petition recently for H-1B Transfer and i got an RFE for the same, is there anything to worry about? or is it a normal process. and can i work till my RFE gets cleared or do i have to wait for it to get clear.

Best Regards, Please help!!