Hey Jonathan, thanks for sharing! Well, what can I say? It's not a bug, it's a feature! But admittedly, there's no way you could fully tell from the label, and we don't have documentation yet. This is meant for email to your own domain, where you want to reply with whichever one of your addresses the sender used to write to you, without setting up a TB identity for each one - so it's catch-all using the recipient address. See my Bug 1806065 Comment 4.
Bug 1811758 Comment 1 Edit History
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Hey Jonathan, thanks for sharing! Well, what can I say? It's not a bug, it's a feature! But admittedly, there's no way you could fully tell from the label, and we don't have documentation yet. This is meant for email to your own domain, where you want to reply with whichever one of your addresses the sender used to write to you, without setting up a TB identity for each one - so it's supposed to be catch-all using the (owned-by-you) recipient address dynamically. See my Bug 1806065 Comment 4.