Last week my #Spotify#PWA install on #Windows suddenly decided to open in a new #Chrome tab rather than a full-screen application. The "Install" button is still present, and clicking it adds a desktop shortcut, but that shortcut opens a new tab in Chrome.
#Spotify also still shows the "Install" button after I've installed it. By contrast, #Twitter's PWA works as expected. After one install click it opens in its own window, and visiting the web page in Chrome shows an "open in application" button instead of install.