adding modifiers to function key fails (Mac KEv14.10.0)

[Joel D Canfield]

Trying to map F3 to left-arrow+left-shift+left-command+left-option

Karabiner seems to refer to the command key as both command and gui, and the option key as both option and alt. None of these results in anything except the left arrow key when I press F3. Virtually identical issue with mapping F4 to r+modifiers. Seems to simply ignore the modifier keys.

{"from": {"key_code": "f3"},"to": [{"key_code": "left_arrow","modifiers": ["left_command","left_control","left_alt"]}]}

{"from": {"key_code": "f3"},"to": [{"key_code": "left_arrow","modifiers": ["left_command","left_control","left_option"]}]}

{"from": {"key_code": "f3"},"to": [{"key_code": "left_arrow","modifiers": ["left_gui","left_control","left_alt"]}]}

{"from": {"key_code": "f3"},"to": [{"key_code": "left_arrow","modifiers": ["left_gui","left_control","left_option"]}]}