To reproduce:

- Open attached "AudioReverbZoneTest" package and load "MainScene"
- Select the Main Camera where the Audio Source is attached
- Hit Play and observe that you hear a looping sound
- Turn on the High Pass Filter in Inspector
- Hit Play in the editor and observe that all frequencies are cut out
- Turn on the Audio Reverb Filter
- Hit Play in the editor and observe that you can not hear anything
- Now turn on the Audio Reverb Zone
- Hit Play in the editor and observe that you can now hear the Audio Source, meaning that the applied High Pass Filter is bypassed