No, it works just fine. It finds Mason and does the check ehich returns OK results except the add-ons for specific languages (e.g. it deteckts python3, complains about misisng rails etc.)

We should strive for the least common denominator :-/

No, no conflict whatsoever. Just an error mesaage that the command is not recognized/present. Telescope works just fine. The colorscheme as well.