Cannot use custom brush with pencil tool?
Hello,
I have a custom brush preset that's about 4x4 pixels large, meant to be used with the Pencil tool. It works fine while the brush tool is selected:

But does nothing when switching to the pencil tool:

I've done some research on this already, and the only advice I've been able to find so far is defining it specifically as a pencil preset. I followed the steps with no results. Any other suggestions would be very appreciated. Thanks in advance!