Adding & Removing emitters ad hoc causes particles to get stuck

[JasXSL]

The sparkles on the keys in this pic get stuck after emitter.remove() is called:

The following is executed when the page loads:

this.sparkleParticles = new SPE.Group({
	texture: {
		value: this.textureLoader.load('./media/sparkle.png')
	},
	blending : THREE.AdditiveBlending,
	maxParticleCount:10000
});
this.scene.add(this.sparkleParticles.mesh);

And the following when a key is pressed:

// Spawn particles
const sparkles = new SPE.Emitter({
	maxAge: {
		value: 0.3
	},
	rotation : {
		//angleSpread : 0.3,
		//axisSpread : Math.PI*2
	},
	opacity : {
		value : [1]
	},
	position: {
		value: new THREE.Vector3(raycastObj.point.x, raycastObj.point.y, raycastObj.point.z+0.1),
		spread: new THREE.Vector3( 0.1, 0.1, 0 ),
		randomise : true,
		radius : 1
	},
	acceleration: {
		value: new THREE.Vector3(0, 0, -0.1),
		spread: new THREE.Vector3( 0, 0, 0 ),
		randomise : true,
	},
	velocity: {
		value: new THREE.Vector3(1, 1, 1),
		spread: new THREE.Vector3(2, 2, 0),
		randomise : true,
		distribution: SPE.distributions.SPHERE,
	},
	angle : {
		spread : Math.PI*2,
		randomise : true,
	},
	color: {
		value: [ new THREE.Color(1.0,1.0,0.0), new THREE.Color(0xFFFFFF) ]
	},
	size: {
		value: [0.3,0.1]
	},
	particleCount: 100
});
this.sparkleParticles.addEmitter(sparkles);
setTimeout(() => {
	sparkles.remove();
}, 1000);
setTimeout(() => {
	sparkles.disable();
}, 100);
console.log(this.sparkleParticles.emitters);

For now I can make a pool of emitters when the page loads and use those. But being able to add and remove emitters ad-hoc would be neat!