That's very interesting. I get the same problem. I don't think
anything is wrong with your code. I think something fishy is going on
with fish, but I don't know what. It looks like it might even be a bug
in fish. I would expect test -n to be the opposite of test -z, but that
is not true sometimes.
There are a few workarounds.
I find that test -z works fine.
Another way to test a variable is
if test ab"$variable"cd = abcd; echo zero; else; echo non-zero; end
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