Brief Description: 
The spyglass overlay overrides the carved pumpkin overlay.

Steps to Reproduce:

1. Place a carved pumpkin on your head.
2. Use a spyglass
3. You will notice that the spyglass overlay overrides the carved pumpkin overlay.

Observed Results:

The spyglass overlay overrides the carved pumpkin overlay.

Expected Results:

Both overlays should be shown

Screenshots/Videos:

I've attached two images showcasing the problem.

Notes:

(I'm not sure whether this is a bug or not. I simply wanted to make sure by posting it just incase).