Map freeze on startup on Android Chrome & System WebView

### mapbox-gl-js version v3.21.0 ### Browser and version Android Chrome 146.0.7680.177 - Pixel 7 Pro (Android 16). The map is normally hosted in a Capacitor 8 app and uses Angular/zone.js. ### Expected behavior Map starts up with the same performance it had on v3.20.0 ### Actual behavior After upgrading to 3.21.0, the map freezes on initial load on mobile. The same page loads in under 2 seconds on 3.20.0. This happens in both the device's Chrome browser and our Capacitor WebView. I captured a Chrome DevTools performance trace on device. Three massive animation frames (8.5s, 11.8s, 5.1s) during map load. The dominant costs are two runs of these: setupDepthForOcclusion → setTerrainUniformValues → set: ~16.5s (total) upload: ~8.6s (total) <img width="1134" height="156" alt="Image" src="https://github.com/user-attachments/assets/088c0def-f124-4f9f-887d-ca74c0d452ad" /> ### Link to the demonstration _No response_ ### Steps to trigger the unexpected behavior This seems to happen running a previously stable map component on Android Chrome as well as Android System WebView in a capacitor app. I can share the specific map style privately to help debug. I've tested with 2 of our styles and had the same result. ### Relevant log output ```shell Nothing came out in the logs ```