Hi, I have the same problem with two of my PWAs. Every time a new version of my app is launched and the service workers reinstall de app, 1 of 4 times the app does not load the custom font, which have all the icons of my site. My site seems broken and buggy due to this iOS bug. Using the suggestions, I added a div to the body with empty content and css styled with my custom font-family and the problem stopped or at least is not as frequent as before.