Godot version

4.2.rc1

System information

Android 13, Samsung Galaxy Z Fold4 (Adreno 730)

Issue description

Lightmap rendering exhibits pixelation artifacts on Android. On parts of the scene, you can still notice bilinear filtering occurring, but only on one axis, so this probably isn't a filter mode issue.

Could this be due to a shader precision issue (missing highp somewhere)?

Note that the double lighting issue when using lights with the Static bake mode isn't related to this issue, as it also occurs on desktop when using the Mobile rendering method there.

Desktop	Android

The Compatibility rendering method isn't affected by this issue when coupled with #85120.

Steps to reproduce

• Export a project that uses a baked LightmapGI to Android and run it on an Android device.

Minimal reproduction project

test_lightmapgi_mobile.zip