Why do I get T-Posed between animations?

Questions
1

Here’s the code:

loader.load( './models/gltf/Xbot.glb', function ( gltf ) {

			const model = gltf.scene;
			model.position.set( 0, 0, 0 );
		
			model.traverse( function ( child ) {

				if ( child.isMesh ) child.material.envMap = envMap;

			} );


			
			scene.add( model );
			console.log(gltf)
			mixer = new THREE.AnimationMixer( model );
			let firstAction = mixer.clipAction(gltf.animations[6]);
			let secondAction = mixer.clipAction(gltf.animations[3]);
			firstAction.setLoop(THREE.LoopRepeat, 3);
			firstAction.play();
			mixer.addEventListener('finished', (e) => {
				//playNextAction();
				console.log(e.action)
				firstAction.fadeOut(1);
				
				secondAction.fadeIn(1);
				secondAction.play();
				
				console.log("finished")
			})