[SalesForce] Can’t add LWC component to App Page using App Builder

Component name is mycmp.

mycmp.html:

<template>
   dfdsdf
</template>

mycmp.js:

import { LightningElement } from 'lwc';
    
export default class Mycmp extends LightningElement {}

mycmp.js-meta.xml:

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata">
  <apiVersion>45.0</apiVersion>
  <isExposed>true</isExposed>
  <masterLabel>mycmp lbl</masterLabel>
  <targets>
    <target>lightning__AppPage</target>
    <target>lightning__RecordPage</target>
    <target>lightning__HomePage</target>
  </targets>
</LightningComponentBundle>

I have deployed the component to my developer org. But it is missing in App Builder for App Page.

I have met the issue during completion of trailhead Use Lightning Data Service to Work with Data

Updated Jun 5, 2020:
List of components from Setup -> Lightning Components: