How to reproduce:

1. Open attached project
2. Attach script NewBehaviourScript.cs to any gameobject in the scene
- Playing the scene at this point should result in a console message that says "Compression and decompression was successful."
3. Build to WebGL and run
- Note the error in the console: "CompressBytes: exception=System.NotImplementedException: Failed to initialize zlib. You probably have an old zlib installed. Version 1.2.0.4 or later is required."