GIMP 2.10.32, Layer Mode Burn Broken?

[rich2005]

I can get that mangled image with Win 10 (VM) / Gimp 2.10.32  https://i.imgur.com/g9BQzW3.jpg  but not in my regular linux Gimp 2.10.32 https://i.imgur.com/5mVD8Qb.jpg

The Windows Gimp shown is a 2.10.32 but there is a newer Gimp 2.10.32-1 installer. I have not got round to trying that yet. Maybe that works.

Nope, tried the Windows Gimp 2.10.32 (revision 1) and that is also broken. 
Send the devs a bug report: https://gitlab.gnome.org/GNOME/gimp/-/issues