Note that Noto Sans looks different when I'm using my own local copy. Mine is an old version using multiple .ttf files, but the latest version is a variable font. So I plan to uninstall the old version and install the new version to see if it helps.
I did that, and it did help. Noto Sans now looks like it should even when I'm not loading any web fonts from Google.
I did that, and it did help. Noto Sans now looks like it should even when I'm not loading any web fonts from Google.