Router - Undo last segment -keyboard shortcut not working

Description

On drawing traces, Undo last segment functionality is not available as a keyboard shortcut as hinted in drop-down menu.

Steps to reproduce

1. Start drawing a track
2. Make a segment by l-clicking.
3. r-click to bring up pop-up menu. Verify that "Undo last segment" is offered and check the shortcut key. (Backspace in the attached screenshot.)
4. Press backspace key on the keyboard. --> Nothing happens. Expected the last segment to be relaxed.

KiCad Version

Application: KiCad PCB Editor

Version: (5.99.0-10369-gb59bf064b4), release build

Libraries:
	wxWidgets 3.0.4

Platform: macOS Version 10.16 (Build 20E232), 64 bit, Little endian, wxMac

	wxWidgets: 3.0.4 (wchar_t,STL containers,compatible with 2.8)
	Boost: 1.75.0
	OCC: 7.5.1
	Curl: 7.54.0
	ngspice: 31
	Compiler: Clang 10.0.1 with C++ ABI 1002

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON