Thanks Josh for the suggestion! I heard back from Blackmagic on this and it’s apparently a little more complicated… Resolve uses the CineForm metadata for timecode instead of the QT timecode track. Even though the QT timecode in my files is spot on, the CineForm TC for everything I encoded starts at hour one. Ugh.
At this point I’m hoping it’s an encoding problem I can fix going to CineForm. No luck so far finding a way to alter the CF timecode itself, but I’m emailing Blackmagic back to see if Resolve can be convinced to see the QT timecode instead.
In the immediate term looks like I’ll be manually re-entering timecodes.