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The reason is a serial kernel msg interfering with the script_output function.

# wait_serial expected: 'SCRIPT_FINISHEDrkD5M-\\d+-'
# Result:
rkD5M
[ 1404.270994] BTRFS info (device vda2): qgroup scan completed (inconsistency flag cleared)
# | Type   | Pre # | Date                     | User | Used Space | Cleanup | Description                          | Userdata                             
SCRIPT_FINISHEDrkD5M-0-

You can try replacing the command with

(echo "Snapper:"; snapper  list) | grep -A1 Snapper: | head -n1

This would still allow the kernel to spit log messages between the "Snapper:\n" and the output of "snapper list".
Especially as echo and snapper are two different processes.

I'm actually not even sure, if the kernel could just print the log messages at any position - not only newlines.

I wonder why this happens that reliably always at exactly this position in the test.