Layer color changes not rendered until map interaction in 11.18.x

Environment

• Xcode version: 26.2 (Build 17C52)
• iOS version: 18.0+
• Devices affected: iPhone (Simulator and Device)
• Maps SDK Version: 11.18.0, 11.18.1

Observed behavior and steps to reproduce

1. Set a layer's color programmatically (e.g., fill color or line color)
2. Observe that the layer color does not visually update on the map
3. Pan or zoom the map
4. The layer color now updates and displays correctly

The color change only renders after user interaction triggers a map redraw.

Expected behavior

Layer color changes should render immediately when the property is set, without requiring map interaction to trigger a visual update.

Works correctly in version 11.14.2.

Notes / preliminary analysis

Regression introduced between 11.14.2 and 11.18.0.

Additional links and references

• Last working version: 11.14.2
• Confirmed broken in: 11.18.0, 11.18.1

Start by reproducing the layer color update on iOS with Maps SDK 11.18.0 or 11.18.1, then compare the behavior with 11.14.2. Investigate the rendering path responsible for programmatic layer color changes; done means fill and line colors appear immediately without panning or zooming.