There are multiple issues with entityRef field which are listed below:
- Placeholder doesn't show
- Unable to populate data via REST api link
- Create contact dialog box doesn't render below search field
- Escape text doesn't showup
It throws a error Uncaught TypeError: Cannot read property 'apply' of undefined
after Search and also action-menu field doesn't behave on selecting record.
Other fixed compability issues are listed in https://gist.github.com/monishdeb/5ca2417d11a31f0b65727a0da1dfe105