mix-blend-mode ignored for objects in clipped groups

Summary:

If objects are in a group, and that group has a clip path, their CSS mix-blend-mode property is ignored while rendering.

Steps to reproduce:

• open Inkscape
• draw some overlapping black and white objects
• change some of them to mix-blend-mode: soft-light
• group the ones with that mode
• assign a clip path to the group

What happened?

The objects render as if they had mix-blend-mode: normal (they appear solid black/white), regardless of their setting or the group's.

What should have happened?

Should still render with their selected mode.

Version info

Inkscape 1.1.1 (3bf5ae0d25, 2021-09-20, custom)