invalid hillshade textures on firefox wayland + amdgpu

[multun]

maplibre-gl-js version: 3.1.0

browser: Firefox 114

Steps to Trigger Behavior

1. visit either the contour lines or 3d terrain demos in FF wayland + amdgpu

Link to Demonstration

https://maplibre.org/maplibre-gl-js-docs/example/contour-lines/

I started debugging the issue and narrowed it down to the draw call in renderHillshade.
On chromium, the hill texture is rendered by spector.js as follows:

On the other hand, on firefox, it seems to be corrupted:

The corrupted texture also explains why the 3D terrain is also affected

Some notes:

• It may be a driver bug (if so, I'd be happy to follow up upstream once the issue is narrowed down further)
• I can't find any other webgl program which exhibits the same issue
• painter.style.map.terrain is null at https://github.com/maplibre/maplibre-gl-js/blob/main/src/render/draw_hillshade.ts#L54, both on firefox and chrome
• this texture seems to be generated by prepareHillshade, so I'd assume it's somewhat likely the issue is related to this function

[HarelM]

There is a branch that addresses some firefox warnings: #2297 I don't know if it's related, but might worth to check.
Otherwise I have no clue how to debug/find the root cause for this issue.