The Brushes-Presets cannot use the brush's Layer-Mode and Opacity.
GIMP version: 2.10.13
Operating System: Xubuntu 18.04
Package: PPA
Description of the bug
Custom brushes and built-in brushes cannot save the brush's layer mode and opacity parameters.(in Tool Options)
I tested GIMP2.10.10, the built-in brush can use these two parameters, when changing different brushes, the two parameters also change.