Steps to reproduce:
1.Launch After Effects 2022 or After Effects Beta
2. Setup a Output Module with Avid DNxHD codec. In my case, it's 1080p DNxHD SQ 8-bit
3. Render the movie.
Result: QT doesn't play with in QuickTimePlayer 7.x or in Avid (according to my editor)
Expected: QT should play in QuickTimePlayer 7.x and Avid
What' you'll note in the attached QTPlayerExample.png is that the FG movie INC_003_010_ptv_v004 (converted) is rendered in the Beta while behind it is v005 that is rendered in After Effects 2021.
System info
Application: After Effects (Beta) v23.1.0.33 ALSO After Effects 2022
OS: Windows v10.0.19044, RAM: 63.68 GB GB, CPUs (logical): 28