Hi there.
I would like to share with you something I have notice on exporting to Apple Proress. Allow me to be more clear.
Since Vegas 17 (export as Magix Intermediate) until Vegas 20 (export as Apple Prores) there is a crazy bug happens.
If you select a preset/template and the press "customize template" you can see the desired frame rate (for example 50 fps).
If you change the frame rate to any value and press the audio tab and then back the video tab, it always goes to 23,976 fps.
So each time someone wants to export to a specific frame rate he must never touch the selection "frame rate".