Hi Colin and all on this thread,
Is there any fix for this issue yet? I am having the same problems with my Sony AX100 footage, both 4K and HD.
This is obviously a major problem. It basically makes logging and organizing footage impossible, and that's not an exaggeration. I add a Description to the clip and that's about it. Can't add Markers or any other type of metadata.
Needless to say..... huge bummer.