I've provided tons of details here. Browsers, operating system, versions, hardware, connection, videos with the problem happening... I reported everything in detail, but the developers refuse to investigate.
They could try to reproduce your problem using similar build conditions. I did everything you show in the video and it works perfectly fine for me, and it will work for them. So how do they investigate if there are no obvious steps to reproduce the issue? If you could find a set of conditions under which you are able to at least build an empty project and report it on their github in detail - they would have something to investigate.
I'd suggest trying to build using a VPN. Since it happens with both WiFi and 4G, maybe there's a problem connecting to server from your location?