"Mask: Draw (Glaxnimate)" doesn't mask properly on 8-bit

Bug
1

What is your operating system? Windows 11
What is your Shotcut version? 26.8.1

Steps:

  • Set Processing Mode to 8-bit.
  • Track #1: Any media clip.
  • Track #2: Text clip.
  • Add a Mask: Draw (Glaxnimate) filter to the text clip.
  • In Glaxnimate, draw a Shape and Save.

Back to Shotcut, the part of the text that is supposed to be masked changes color instead.
The filter works properly when switching to 10-bit.

Maybe related to this bug report? And already fixed?

2

This is fixed for the next version 26.9. The problem was specific to the subtract operation (and 8-bit).