Detect Volume on Collision

I'm trying to write a script that detects the volume on collision with another object. The intention is to have the player object grow in size when it collides with objects that have less volume than itself. Very new to this and managed to piece together what I have below using the Google and this site as a resource. I've had some success, but have been running into weird results where the player object will refuse to grow after colliding a few times.. I'm not sure what the issue is, but would be curious to know if there's anything i'm missing or if there's a more efficient way to do this. Any advice or suggestions would be helpful!

 {
     
     private BoxCollider playerCollider;
     public float playerVolume;    
 
     void Start()
     {     
         playerCollider = GetComponent<BoxCollider>();
         Vector3 geometry = playerCollider.bounds.size;
         playerVolume = geometry.x * geometry.y * geometry.z;
     }
 
     void OnTriggerEnter(Collider other)
 
     {
         
         Vector3 geometry = other.bounds.size;
         float otherVolume = geometry.x * geometry.y * geometry.z;
 
         if (playerVolume > otherVolume)
         {
             transform.localScale += new Vector3(1, 1, 1) * growthRate;
         }
             
     }
 }