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RGB565 textures broken since r136

See original GitHub issue

Describe the bug

Since r136, RGB565 textures will be rendered black instead of their proper colors.

To Reproduce

Steps to reproduce the behavior:

Use the code below to show a simple RGB565 texture. See only blackness. Change threes version to any version before r136, see the plane with a red, green, blue, and white rectangle.

Code

      import * as THREE from 'https://cdn.skypack.dev/three@0.135.0'

      const scene = new THREE.Scene();
      const camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
      
      const renderer = new THREE.WebGLRenderer();
      renderer.setSize( window.innerWidth, window.innerHeight );
      document.body.appendChild( renderer.domElement );
      
        const data = new Uint16Array([
          0x001F, 0xF800,
          0x07E0, 0xFFFF,
        ])
        const map = new THREE.DataTexture(data, 2, 2, THREE.RGBFormat, THREE.UnsignedShort565Type)
      
      const geometry = new THREE.PlaneGeometry();
      const material = new THREE.MeshBasicMaterial( { map } );
      const obj = new THREE.Mesh( geometry, material );
      scene.add( obj );
      
      camera.position.z = 1;
      
      function animate() {
      requestAnimationFrame( animate );
      
      renderer.render( scene, camera );
      };
      
      animate();

Expected behavior

Not display any RGB565 texture as black.