Well, methods are now documented but implementing them doesn't result in any electric vehicle options showing up in Maps.
The user guide suggests I should see these options here: https://support.apple.com/en-gb/guide/iphone/iphc5e3a4b4b/ios
I've run out of options this point and I'm going to use a Developer Technical Support ticket to find out more. I can only assume that you either need special permissions or that the feature is not yet enabled.
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Apple has confirmed via my TSI that this feature currently does not work due to a bug. It has been filed as Feedback (FB8760513) and I have used another TSI ticket to ask them for any potential workarounds.
Seeing this exact issue and can confirm that the empty navigation link does seem to resolve it for me too. I do see Unable to present. Please file a bug. in the console too.
This has retroactively broken our App Store build with no updates which is the most annoying part..