Writing sharded VCF fails on read

[tamirkamara]

Hi,

I've tried to read some single sample VCF files, do some filtering and merge them while writing the result as a sharded VCF. To do this I used my own header taken from an existing VCF file which I think contain the right headers with all the samples noted.

After that has been done, I try to read the result in a new dataframe but receive this error:

We never saw the required CHROM header line (starting with one #) for the input VCF file

However, that line exists in each part file (confirmed with bcftools).

Did you see this before?