Mismatch in Form 16 Part A & B

The form 16 part A is showing amount credited for Q3 & Q4 (FY 18-19) only ~ 2.5 Lakhs (Tax is deducted only for these two quarters). Form 16 part B is showing the complete salary ~5 Lakhs. I have no issues with 26AS. (I was employed for the full FY)

Is it perfectly fine since I was questioned in by my new employer as to why Q1 & Q2 data is missing for that FY?

Is there any circular link which says the employer need not feed in the data for 24Q if the income in that Q is not taxable?