Audio Plugin components can not be dragged up/down in Inspector

To reproduce:
- Open attached project and launch "test" scene
- Double-click on "New AudioMixer" asset and dock the Audio Mixer window
- Click on "Drums" and go to Inspector
- Try to drag one of the customized plugin components up/down
- Observe the dark overlay, but the component is not moving
- Observe also the following error message:

MissingMethodException: Method not found: 'UnityEditor.IAudioEffectPlugin.GetParameter'.
UnityEditor.AudioMixerEffectView.DoEffectGUI (Int32 effectIndex, UnityEditor.Audio.AudioMixerGroupController group, System.Collections.Generic.List`1 allGroups, System.Collections.Generic.Dictionary`2 effectMap, System.Int32& highlightEffectIndex) (at C:/buildslave/unity/build/Editor/Mono/Audio/Mixer/GUI/AudioMixerEffectView.cs:370)
UnityEditor.AudioMixerEffectView.OnGUI (UnityEditor.Audio.AudioMixerGroupController group) (at C:/buildslave/unity/build/Editor/Mono/Audio/Mixer/GUI/AudioMixerEffectView.cs:132)
UnityEditor.AudioMixerGroupEditor.OnInspectorGUI () (at C:/buildslave/unity/build/Editor/Mono/Inspector/AudioMixerInspector.cs:18)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor editor, Int32 editorIndex, Boolean forceDirty, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect, Boolean eyeDropperDirty) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1118)
UnityEditor.DockArea:OnGUI()