Glitches come back, mate... And it is really frustrating. Went back to FCP X.
The proxies were encoded with media encoder in 24 hours, with Final Cut create proxy it took only half as much time.
I would think, Media Encoder only uses 1 video card, or an inferior algorithm.
Nevertheless. ADOBE we earn our income with your software, and you did not fix this MAJOR issue in more than a month.
I believe, you were kinda screwed, since Resolve had similar issues, but FCP X had no problems whatsoever, so you need to find a solution.
Not being able to fix it in such a long term, would teach us 2 things. Not to upgrade, until others confirm its safe. Not to use ADOBE software for critical work.
Please let us know how long until, you can safely say, you have a fix for this issue!