Animation loop in reverse play doesn't stop at last frame

Questions
1

animControl = (operation:string, animations:any, from:number, to:number, loop:string, speed:any, callback:any, isPlayAnimCompat:boolean, rev:boolean, view:any) => {
if (!animations)
return;

if (typeof animations == “string”)
animations = [animations];
this.mixer = new THREE.AnimationMixer(this.model.scene);

let animationProcess = (animationName:any) => {

    this.animationPlay = this.mixer.clipAction(animationName)
    if (! this.animationPlay)
      return;  
      switch (operation) {
        case 'PLAY':
            if (! this.animationPlay.isRunning()) {
                  this.animationPlay.reset();

                 
              
                  let scene = this.getSceneByAction( this.animationPlay );
                  let frameRate =  this.getSceneAnimFrameRate(scene);
                
                // compatibility reasons: deprecated playAnimation puzzles don't
                // change repetitions
                if (!isPlayAnimCompat) {
                  this.animationPlay.repetitions = Infinity;
                }

                let timeScale = Math.abs(parseFloat('0.05'));

                if (rev){
                  timeScale = -Math.abs(parseFloat('0.05'));          
                }
                this.animationPlay.clampWhenFinished = true;  
                this.animationPlay.setLoop( THREE.LoopOnce ) 
               
                let startTime  = from/frameRate 
                
                this.animationPlay.timeScale = timeScale
                if (to !== null) {
                  this.animationPlay.getClip().duration = to/frameRate;
                } else {
                  this.animationPlay.getClip().resetDuration();
                }
               
                this.animationPlay.time =  timeScale >= 0 ? startTime : this.animationPlay.getClip().duration;     
                                 
                let val = this.animationPlay.getClip().validate()
              
                if(val){ 
                  if(!this.animPause){
                    this.animationPlay.setEffectiveTimeScale(timeScale).play() 
                  }else{  
                    ///
                  }
                }else {
                  console.log("Not valid clip")
                }

            }
            break;
        case 'STOP':
          //  this.animationPlay = action
            this.animationPlay.stop();
            
            // remove callbacks
            let callbacks = this.animMixerCallbacks;
            for (let j = 0; j < callbacks.length; j++)
                if (callbacks[j][0] == this.animationPlay) {
                    callbacks.splice(j, 1);
                    j--
                }     
            break;
        case 'PAUSE':           
          this.animationPlay.paused = true;
            break;
        case 'RESUME':               
          this.animationPlay.paused = false;              
            break;
        case 'SET_FRAME':
            let scene = this.getSceneByAction( this.animationPlay);
            let frameRate = this.getSceneAnimFrameRate(scene);
            this.animationPlay.time = from ? from/frameRate : 0;
            this.animationPlay.play();
            this.animationPlay.paused = true;
            break;
        }
       }
        for (let i = 0; i < this.model.animations.length; i++) {        
          let animName = this.model.animations[i];
            if (animName)
            animationProcess(animName);
        }


        
      //  this.initAnimationMixer();
      
      this.camera = view ? this.model.cameras.find(o => o.name === view) : this.model.cameras[this.cam];
     
      this.animate()

  }

animate = () => {
if(this.animationPlay){
if (this.animationPlay.isRunning()){
requestAnimationFrame(this.animate);
}
if(this.mixer){
this.mixer.update(Math.min(0.05, this.clock.getDelta()))

}

}

this.render()
}
can anyone can help me in this ?.