Place holder is not visible for phone number mask
Place holder to be visible and on focus the input format and mask to be applied while user is entering data
https://codesandbox.io/s/kind-jang-0wmx3i?file=/src/App.js
It's because you have allowEmptyFormatting ={true}, which will format the box when empty and thus override the placeholder. Docs
You can see the placeholder if you set it to false. So confirming its a config output and not related to any browser
allowEmptyFormatting ={false}