How to access alternative numbers on the stock Samsung Dialer

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Maybe I'm just going mad, but after a full reset, I think I'm missing some functionality in the Dialer.

If I pull up the Dialer, and start using T9-like search, e.g. search for "John" by dialing 5646, then the drop down list will pull up all the Contact called "John" (or that match other letters on those keys), or have "5646" in their number. If you click the down arrow/count, then the list is popped up.

Each Contact has their "default" number listed (if the default is not explicitly set on the contact, I think it uses the first/only number defined).

If you wanted to use a number other than the default, I was pretty sure that you could tap the thumbnail image to show the alternative numbers, and select from there, but this isn't working for me. Tapping the area other than the image selects the default number, but tapping the image has no effect.

Does anybody know how to get the Dialer to show the list of alternative numbers? Is it a setting/permission that I'm missing?