Im using RV 2023.0.2
repro:
open RV load a mov (without timecode) the clip starts at frame 1.
set Range Offset or Range Start to make clip start at frame 1000.
Export OTIO file.
Clear Session
Import OTIO file
Default Sequence2 contains repeated last frame for the duration of the original mov
In my case my mov has 30 frames so the Sequence repeats frame 30, 30 times
Both RVFileSource.group.rangeStart, RVFileSource.group.rangeOffset cause issues.