Just implemented the fix for this, which should be released today. I’ve implemented an extra check in the recipe to avoid iterating over words which don’t have a vector, to avoid the warning spam.
In the meantime, you can set the environment variable SPACY_WARNING_IGNORE="W008" to prevent the warnings from coming up. The warnings are really the only problem here: with so many warnings printed, the loop runs fairly slowly, which is why you’re not seeing anything coming up. If you suppress the warnings and let the similarity function run, you should see results.