Hi!
I’m having troubles adding or removing brushes to pop up palette. When I try do it the brush delay a lot to appear on pop up palette or, simply, doesn’t appear at all and the same thing happens trying to remove it.

It doesn’t happens with all the brush presets, just some of them and I’ve also noticed that it remains tagged although the palette is not showing them.

Has someone experimented something similar?
Any idea about the reason?

I’m using Linux Mint 20 but the same thing happened on 19 version.

Thanks in advance.