After redoing window configuration with winner-mode, the popwined window cannot be closed with "C-g"

[IceAsteroid]

Hi, dear developers.

I have some issue encountered.

If I enable winner-mode in Emacs, and open up a window said the "Help" buffer in it, and the buffer is already specified in popwin like follows:

(push '("*Help*" :stick t) popwin:special-display-config)

After I close it normally or whether with "C-g", and restore the window configuration back by (winner-undo), so the window is back again,

but this time, the window cannot be closed with "C-g" keybinding anymore.