How to reproduce:
1. Create new 3d project
2. Switch platform target to WebGL
3. Build and run

Expected result: Build succeeds
Actual result: Exception is thrown in the console:
"The resource Internal-ErrorShader.shader could not be loaded from the resource file!"
"The resource Soft.psd could not be loaded from the resource file!"
"The resource UnitySplash-cube.png could not be loaded from the resource file!"
" GL.End requires material.SetPass before!" ...

Building WebGL on Linux, on Unity 2021.2 (after the incremental build was implemented for WebGL), results in unity_default_resources not being included in the resource data file.

Affects Unity 2021.2+
Affects all Linux distributions.
Not repro on Windows or macOS