BGZIPMalformedHeaderException: Block gzip magic not found in header

[vepain]

I have a asm.gfa.gz file for which the testing command bgzip -t asm.gfa.gz returns a non-error code.

Also, bzip -d asm.gfa.gz works.

However, I can't read the file through the Python API:

with (
  filepath.open("rb") as f_in,
  bgzip.BGZipReader(f_in) as g_in,
):
  text_in = io.TextIOWrapper(g_in, encoding="utf-8")
  for line in text_in:
    print(line)
  text_in.close()

Error log attached
If necessary, I can send you in private the asm.gfa.gz file

err.log