hexdump Europe/London tzfile(5) not advancing offset pointer across many line format file

[BrianInglis]

Running hexdump on tzfile(5) Europe/London from tzdata 2024a (data is in network big-endian order - so sticking to hex):

$ ls -lgo /usr/share/zoneinfo/Europe/London
-rw-r--r-- 6 3664 Mar 28 01:26 /usr/share/zoneinfo/Europe/London
$ hexdump -f tzfile.hd /usr/share/zoneinfo/Europe/London > tzfile-hd.log

format file:
tzfile.hd.txt
trying to produce better output than a series of xxd commands shown as a script at bottom with log output.
It appears the hexdump input offset does not advance over many lines of input formats, then it does and sticks again, and so on:
tzfile-hd.log

It appears that every format string in a file needs to be on a single line for hexdump to work properly:
$ hexdump -f tzfile-1line.hd /usr/share/zoneinfo/Europe/London > tzfile-1line-hd.log
tzfile-1line.hd.txt
tzfile-1line-hd.log

There appear to be no non-trivial hexdump format or format file examples in the man page or on the web!

xxd script and output log:

while read s l g
do 
    xxd -s 0x$s -l 0x$l -g $g	/usr/share/zoneinfo/Europe/London
done <<-EOF
	  0  2c 4
	 2c 3c8 4
	3f4  f2 1
	4e6  30 6 -c 12
	516  11 1
	527  10 1
	537  2c 4
	563 790 8
	cf3  f2 1
	de5  30 6 -c 12
	e15  11 1
	e26  10 1
	e36  1a 1
EOF

tzfile-xxd.log