Thanks! It looks like this is adding leading spaces on every line after the first one. The solutions can be viewed https://oops.cmdchallenge.com/#/oops_print_file_contents by clicking on "view solutions" if you want to compare.
For the ^W thing I'm not sure if it's possible to avoid it, I'll check it out.
Getting stuck on #/oops_print_file_contents - the command times out. Not sure if I'm missing a better solution or perhaps the server is overloaded
The command I tried was (here protected with rot13):
zncsvyr sbbone < zl-qvffregngvba.gkg; rpub "${sbbone[@]}"
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A mild irritant is that the usual ^W (delete word to the left) instead closes tab in Firefox. Perhaps this could be prevented...?