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One indirect answer is in the first two lines you posted. The transid's for the two Btrfs devices are the same, which they wouldn't be if their underlying luks volumes weren't both unlocked. Btrfs does not mount degraded by default either, so it'd fail to mount. You'd definitely know about it.

Slightly more direct but I can't point to any documentation, plymouth is what's asking for the passphrase is my understanding, and it passes the first passphrase you enter to all LUKS devices and only asks per device for devices that fail to open with that passphrase. Ergo if you enter it wrong, now you have to enter the passphrase in twice more (total three times: 1 failed, 2 for devid1, 3 for devid2) correctly to get it to unlock and mount.