curious bbplay boot issue

Hi all,
I’m seeing a curious issue booting the bbplay.

I have an SD card inserted, where the sd card and the emmc both have the same os installed - the 2023-06-01 image with all updates applied. When cold booting (apply power or press pwr button when unit is down) it boot’s from the sd card, as expected. But when issuing a reboot command, it always boots from the emmc. Had me very confused for a while.
Not sure what I could have done to cause this, but I did have a flash from sd to emmc fail a while back.

Thanks, Paul