The issue is when do this: tap 🔍 to search, then tap a contact, then tap "Add keyword" (add keyword).

For example, I tap "Contact1" and "Keyword1", the results contain:
Contact1, Keyword1
Contact2, Keyword1
But shouldn't the results only show the emails frim Contact1 containing keyword1?. After all, that's the reason why I initially tapped Contact1 - to search only with Contact1's emails. Otherwise, if I wanted to search ALL emails for Keyword1, then I would have just entered Keyword1 after tapping🔍 button, and not tapped Contact1 at all.