Not OK. A piece of video near the end of the file refuses to be edited correctly. I even edited out the piece of wanted video with 1 sec of material before an after and when I edit that piece of video, it want to chop off 34 frames of video and not chop the audio along with it, i.e., the audio is intact, but the video isn't.
I thought I had it all working, but discovered other edit points that were screwed up. Editing 720p/59.94 - HEVC@4:2:2 just can't be done without errors. I'm going to convert the whole unedited file to H.264/4:2:0 so that I can edit it.