Hsn-wise summary gstr1 quarterly column 12 blank

Is column 12 in GSTR1 for HSN-wise summary mandatory for the people who have opted for quarterly returns with less than 1.5 Cr turnover.

What if the for HSN-wise summary column was filled for the GSTR1 for July and left blank in August-September.

Can we leave the Column 12 for HSN-wise summary in GSTR1 blank.

And will it be ok if we leave it blank now for August -September returns, if was filled for July

Have seen many people leaving the Column 12 for HSN wise summary in GSTR1 blank is that going to create any problem in the future.

Is there any notification w.r.t leaving it HSN wise summary in GSTR1 blank.

And if HSN-wise summary in GSTR1 is mandatory do we need to fill in the details separately in the quarterly returns. for eg. add details for HSN details of Aug then again add details for HSN of Sep in the same return or need to be done only once.

And is the same required to be done for Column 13 Documents issued eg. Add details of invoices of August then again add details for invoices of September in the same return or need to be done only once.

Thanks