Following the doc:
for a single post wpress 6.2 loads single.html ( and if none index.html) ok.
If we follow hierarchy diagram, a post with specific taxonomy XX will be :
single-XX.html ( ie single-{slug of taxonomy} ) as it is in php.

But this doesn’t work, stays to single.html. What’s wrong ? unforeseen ?

(by the way, same thing with tag )

thanks