How to reproduce:
1. Open the "WebGL_Build_Bug" project
2. Open the “SampleScene”
3. Make sure to switch Build to “WebGL” (Edit > Build Settings)
4. Build And Run
5. In Editor, observe errors logged to the Console

Expected result: the WebGL Player is built successfully
Actual result: the WebGL Player is not built, and the Editor logs errors to the Console

Reproduced with: 2021.2.0a8-2021.2.0a11
Not reproduced with: 2020.3.47f1, 2021.2.0a7, 2021.3.22f1, 2022.2.15f1, 2023.1.0b12, 2023.2.0a10
Fixed in: 2021.2.0a12

Reproduced on: Windows 11

Editor Build error logs:
Log #1:

{noformat}Build completed with a result of 'Failed' in 7 seconds (6782 ms)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun (){noformat}

Log #2:

{noformat}UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002ca] in <40e0f89d03e04ba1acbe14c6bc2cc603>:0
at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <40e0f89d03e04ba1acbe14c6bc2cc603>:0
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun (){noformat}