As there are already several posts regarding Inter, this question is a continuation. If the preference is to start a new conversation, feel free to shout.
Selecting the Inter font from Customizer for headings does not appear to take effect. For example, this is the current setting for h1 headings.
When a h1 heading is added to a page, the font does not render. It only applies font type, when explicitly selected. For instance, the details below have to be set.