Line layer with fill-pattern disappears in combination with raster-dem terrain.

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**mapbox-gl-js version**: v3.10.0, works as expected in v3.9.4

**browser**: Chrome, Safari, Firefox.

### Steps to Trigger Behavior

1. Add a `line` layer with `line-pattern` set to an image pattern.
2. The line pattern is visible on the map.
3. Add a `raster-dem` source and enable it with `setTerrain()`.
4. The line pattern disappears.
5. Removing the fill-pattern property shows the lines correctly.

### Link to Demonstration

[jsfiddle Example](https://jsfiddle.net/9a2bvz48/11/)

### Expected Behavior

The `line-pattern` used to render correctly on the line layer, even when terrain is enabled.

### Actual Behavior

When terrain is enabled using `setTerrain()`, the `line-pattern` stops rendering entirely. The issue persists across different `line-pattern` images and remains even when adjusting zoom, pitch, or bearing.

Reproduce the issue using the linked JSFiddle with a line layer using line-pattern, then add a raster-dem source and enable terrain with setTerrain(). Compare the behavior with v3.9.4 and without the fill-pattern property; done means the line pattern renders while terrain remains enabled across the reported browsers.

Written by the indexing model from the issue text.