from pathlib import Path

path = r"/path/to/AN-A401.sgy"

a = Path(path).stat().st_size - 3600
trace_lenth = 2560 
b = trace_lenth * 4 + 240
assert (a % b == 0)
# asserting that the file length is exactly as it should be

import segyio

segyio.open(path, ignore_geometry=True, mode="r", endian='big')
# yields error: RuntimeError: trace count inconsistent with file size, trace lengths possibly of non-uniform

# Other programs do work, including seisee and obspy.
from obspy.io.segy.core import _read_segy
st = _read_segy(path, format="SEGY")