Although there is a valid manifest.json and <link rel="manifest" href="manifest.json"> in the head tag, chrome shows No Manifest Detected, service workers are installed successfully and http://127.0.0.1:8080/manifest.json is fine and accessible, but chrome not even requesting the manifest.json file! this is a flutter project which currently build for web using flutter build web --release
Finally I figured out the bug was introduced by flutter_native_splash which added some picture tag to the root of html page which caused the chrome not requesting the manifest.json, so moving the picture tag to body solved the issue.