I noticed that i was not able to select any Validations on a text field. and after digging i noticed that if you insert a Input field it defaults to type=“text”, all good.
If you then change the type from the properties panel and set it to ‘text’ again the type= attribute vanishes from the code causing the Validation selector to fail to load.
Other types, hidden, password, email etc all work fine. and inset type= into the code.