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Description
In https://html.spec.whatwg.org/multipage/forms.html#the-difference-between-the-field-type,-the-autofill-field-name,-and-the-input-modality you show an example of using <input type="tel"> combined with autocomplete=tel-national - which seems to make sense.
Anyway, this contradicts https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofilling-form-controls:-the-autocomplete-attribute where all tel-* autocomplete values are surprisingly limited to text-like inputs which does not include type="tel". This rule is also used by the HTML validator.
Suggestion: Change the control group for all tel-* values to "Telephone" - which is what anybody would expect.