Bug summary

The Quadmesh Demo shows how to set the "bad" color on a colormap to make the masked region yellow. However, it does not work in the current version.

Code for reproduction

https://matplotlib.org/3.8.2/gallery/images_contours_and_fields/quadmesh_demo.html

Actual outcome

Expected outcome

With v3.7.3 we had
https://matplotlib.org/3.7.3/gallery/images_contours_and_fields/quadmesh_demo.html

Additional information

If we remove shading='gouraud' from the pcolormesh call, the example works as expected.

Operating system

No response

Matplotlib Version

3.8.2 and main

Matplotlib Backend

No response

Python version

No response

Jupyter version

No response

Installation

None