This looks fine in the latest stable chromium on bionic (and in the snap too). See attached screenshot. The only place where the rainbow is not rendered correctly is in the tab handle, but that's a different issue than the one originally reported.
This looks fine in the latest stable chromium on bionic (and in the snap too). See attached screenshot. The only place where the rainbow is not rendered correctly is in the tab handle, but that's a different issue than the one originally reported.