Are you on Windows? This is a major bug on some Windows computers. I’ve brought it up in the monthly UXP Developers Office Hours, but no one at Adobe seems to know about it or how to solve it. I’ve had several customers experience this problem. They are all on Windows computers. I think it might be related to admin privileges as it does not happen on all Windows computers. Fortunately only a rather low percentage experience this, but it definitely happens consistently. There are two solutions:
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Use a third-party installer like Anastasiy, ZXP Installer, or Aescripts+aeplugins. If one third-party installer doesn’t work, try another one. Almost everyone finds one that works.
I don’t think this problem will affect the Adobe review of your plugin as it is likely a problem related to your computer (not the plugin), and Adobe has not acknowledged that this problem even exists as far as I know.
However, if you are a developer and are experiencing the command-window flash when trying to install a plugin via .ccx files, you should get some logs and/or contact Adobe as getting this problem solved would be much appreciated.
Log collector tool is here: Allow offline development - #14 by Erin_Finnegan
I apologize if I have pulled your post in the wrong direction, but the command-window flash has been diagnostic for this very frustrating problem with all my customers who have experienced it. If you find a solution, please post it.