If you want to refresh the book list from a GUI plugin, you dont need to use IPC. Refreshing the book list is trivial to do, look at any number of plugins that do it or look at for instance how the builtin edit metadata action does it.
I have no clue why you were using IPC to refresh the GUI in your GUI plugin. GUI plugins run the in the same process as the rest of the GUI and should ever need to use IPC to communicate with it.
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