Pcbnew stealing only some of my docked python control's keystrokes

I have created wx.ComboBox that can be docked in pcbnew, using AuiManager style window.

When the pane containing the ComboBox is floating, the combobox receives all the keystrokes. However, when the pane is docked with the Pcbnew window (the pane’s parent), pcbnew itself steals keystrokes that are hotkeys. The following shows me trying to enter ‘pop’ into the combobox. The ‘p’ key is recognized and entered, but the ‘o’ key is captured as a hotkey in pcbnew.

How can I prevent this?

Further testing reveals something very strange:

Only lowercase ‘o’ and capital ‘X’ are captured by the pcbnew frame when focus is on the wx ComboBox docked in the pcbnew frame…
(‘Add footprint’ and ‘Add track’ respectively)

When the frame has focus, capital ‘O’ doesn’t do anything, while lowercase ‘x’ activates ‘Add track’.

All other letter characters (lower and upper case) are ignored while focus is on the docked wx combobox.

Anyone able to duplicate this or know why?