Note: At first, was on iPad Pro... there was cache issue. Need to make an habit of clearing iOS' Safari as often. It's annoying to do it manually.
Now, on desktop... Ubuntu's Firefox (auto clear cache/history after closing browser). Will not update until language module(s) are updated first (while on "11.0.0", need to update language(s) to "11.0.1". Afterward, successful updated to 11.0.0-RC1 then updated the rest of modules.