After adding another layer, I was going to add a filter, but when the menu for the filters popped up, the mask was on the layer below. After canceling the filter mask, it deletes the layer i was originally was going to add a filter to.

Reproducible: Always

Steps to Reproduce:
1.draw something on one layer
2.add another or duplicate layer
3.covert second/duplicate layer to filter mask

Actual Results:  
It applies a mask to the layer below 

Expected Results:  
should have applied mask to the chosen layer