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gzip -t output “gzip: filename.gz: extra field of X bytes ignored”

I have a bunch of .gz files I’m checking the integrity after data transfer with gzip -t -v file
the output I’m getting is

gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
....
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
gzip: C2_CRRA200017850-1a_H3LJWDSXY_L1_2.fq.gz: extra field of 6 bytes ignored
OK

What do these repeated lines indicate and how I get just the final OK as output?

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