After installing v2.docusaurus.io as a PWA on Windows through Chrome and then relaunching it, I am just greeted with the manifest.json file. See gif below:

Yes.
v2.docusaurus.io through Chrome.+ button to install the site as a PWA.manifest.json appears.The app should show the site and not just the manifest.json file.
The manifest.json file is shown.
Can be tested through v2.docusaurus.io.
I've test this in the new Microsoft Edge on Windows 10 and in Chrome/Microsoft Edge on MacOS and it's doing the same thing. Our personal app is working. I suspect it might be an issue in the manifest.json file here manifest.json#L7. I _think_ the scope and start_url should both be "/".
Thanks, you are right.
Tried to find a solution here so that our deploy preview under baseurl still work to install/test the PWA setup: https://deploy-preview-3438--docusaurus-2.netlify.app/classic/
But apparently this broken both after you relaunch the app 馃槄