React-Admin component doesn't trigger the "UPDATE" action in the data provider

Question

So I'm using the ra-data-json-server as a data provider and the bult in <SimpleForm> component as a form for the <Edit> view, and I'm facing a pretty strange issue, as it says in documentation, when submitted, the <SimpleForm> forces data provider to make a PUT request to the API, but in my case it does not. Here's my Edit view compnent:

export const UserEdit = props => {
  return (
    <Edit {...props}>
      <SimpleForm>
        <ArrayInput source="applications">
          <SimpleFormIterator source="applications">
            {/* some inputs */}
          </SimpleFormIterator>
        </ArrayInput>
      </SimpleForm>
    </Edit>
  );
};

And the admin component itself:

export const AdminComp = () => {
  return (
    <Admin
      loginPage={CustomLoginPage}
      authProvider={authProvider}
      locale="ru"
      i18nProvider={i18nProvider}
      dataProvider={dataProvider}
    >
      <Resource
        name="students"
        list={UserList}
        edit={UserEdit}
      />
    </Admin>
  );
};

And everytime I get into the Edit view and hit the save button it just doesn't do anything.

I managed to make it at least call the update in data provider, but it would call it with the old form data even though it was modified already.

I also tried reinstalling react-admin to the latest version which is what some people reccomended but it didn't help.