AME Looses clip time code when stitching

I want to make on MP4 screener for folks from multiple raw camera files (OP1a MXF XDCAM 50), with burned in time code. When I add the clips as a stitched clip, and then add the time code burn effect, the effect doesn't pull time code from the source MXFs but instead generates it's own time code for the resultant stitched clip. I toggle between time code source from media to generate, and back, and nothing changes.