When renaming an exposed parameter of Audio Mixer, renaming it fails and errors appear in the console.

Steps to reproduce:
1) Open the attached project.
2) Double click on the Audio Mixer in /Assets folder.
3) In the top-right of Audio Mixer window, click on 'Exposed Parameters'.
4) Right click on any of the exposed parameters > Rename.

An error appears in the console:
BeginRename fail: already renaming
UnityEditor.RenameOverlay:BeginRename(String, Int32, Single)
UnityEditorInternal.ReorderableListWithRenameAndScrollView:BeginRename(Int32, Single) (at /home/builduser/buildslave/unity/build/Editor/Mono/Audio/Mixer/GUI/ReorderableListWithRenameAndScrollView.cs:181)
UnityEditor.GenericMenu:CatchMenu(Object, String[], Int32)

Sometimes, the parameter cannot be renamed at all (input is ignored), sometimes only the error appears, but the parameter can be renamed successfully. This does not occur on other platforms.

Reproduced on:
5.6.0b6, 5.5.1p3, 5.3.6f1