Baz, the newer model has an update that takes it from the advertised "40 ish" to the "50 ish" mark. I always assumed the 40'ish did not take in consideration losses between the supplier and the recipient hence the nearer 36 you state.
"The MX-30's charging ability received a welcome boost in 2022, improving from 40kW to a 50kW capability. Previously, the all-electric small SUV could manage a charge from 10 to 80 per cent in 39 minutes, while the revised system means a 20 to 80 per cent top-up takes 26 minutes"
According to my calculations even the upgrade will not deliver a true 50 but nearer the mid 40's all being well if you take 20 to 80% in 26 minutes based on 35.5 total battery not the 30.5 usable.