I agree that this behaviour looks intentional - whether it is behaving as intended is another matter - most likely it was not intended to happen so frequently. I have 4 computers running Avast Free v20.5 and all are showing this behaviour.
I uploaded the requested Support Tool data back in post 5 of this thread along with posting the full Command Line data from a problem instance of this AvastUI issue. But have heard nothing since.
The data included in the Support Tool file is quite extensive and includes complete config data about your computer, plus all the Avast logs - you can view the ZIP file after it has been uploaded but not before (unless you block the upload). Mine had 204 items of which 156 were Avast specific - the rest being data about my computer including lists of services, drivers, installed software, event logs, internet connection config details and logs, Hosts file, and selected registry settings. So if you are paranoid or just running suspect software you might get a little worried about what you could be revealing.