Solo does not work as expected

Here is what I've done:

Assigned "Solo Track 1" to MIDI note 60 Assigned "Solo Track 2" to MIDI note 61 Assigned "Solo Track 3" to MIDI note 62

With a blank session, I hit the button assigned to "Solo Track 1"... it goes into record... While it's recording, I hit the button assigned "Solo Track 2" and I would expect that Track 1 would MUTE and play Track 2 EXCLUSIVELY, but it does not. Instead it plays BOTH tracks... therefore NOT in solo.

Is this a bug?