White fg color, black bg color, though terminal is opposite in MSYS2

I use MSYS2 system on Windows 10. For quite some time (let's suppose year)
I used system without update. I used nano as well. Version 7.2
particularly. Terminal in MSYS2 is called mintty. It supports themes. I use
theme called kohlrausch. It is bright theme with white bg and black fg.

All was good before I decided to update. Nano draws black bg and white fg
now, which is not what I want.

I use mutt mail client also. Nano and mutt use ncurses library. Mutt works
fine. So, nano does something wrong.