Hey Tyler!
I reproduced this with your exact branch names. The CLI branch picker uses fuzzy matching that strongly favors matches starting at a word boundary, so a bare "4" or a mid-word suffix like "604" gets filtered out, while prefixes (and boundary-aligned bits like "ms4" or "3604") match. I'm flagging it to the team, no ETA to relay but once we have movement I will double back and alert you.
Thanks!