Item with '' as value is rendered as disabled in a select since Vaadin 22 alpha 3

[Artur-]

Description

A select looks disabled when the value is set to ''. There is no has-value attribute set on the select.
This was introduced in V22 alpha 3.

Expected outcome

A Select looks the same regardless of if the value is 'foo' or ''.

Minimal reproducible example

import '@vaadin/vaadin-item/vaadin-item';
import '@vaadin/vaadin-list-box/vaadin-list-box';
import '@vaadin/vaadin-select/vaadin-select';
import { html, LitElement, render } from 'lit';
import { customElement } from 'lit/decorators.js';
import { guard } from 'lit/directives/guard.js';

@customElement('select-basic')
export class Example extends LitElement {

  render() {
    return html`
      <vaadin-select
        value="recent"
        label="Sort by"
        .renderer="${guard(
          [],
          () => (root: HTMLElement) =>
            render(
              html`
                <vaadin-list-box>
                  <vaadin-item value="">All of them</vaadin-item>
                  <vaadin-item value="one">One</vaadin-item>
                  <vaadin-item value="two">Two</vaadin-item>
                  <vaadin-item value="three">Three</vaadin-item>
                </vaadin-list-box>
              `,
              root
            )
        )}"
      ></vaadin-select>
    `;
  }
}

[web-padawan]

Added this to the upcoming spring. This is a regression that we need to fix ASAP.