NRF Connect for VS Code doesn't save configuration changes

I have been attempting to add a -Dmcuboot_OVERLAY_CONFIG item to the "Extra CMake arguments" section of the Build Configuration page.  When I do, the build successfully completes and the Build Configuration page closes.  Next time I open the build page, the CMake argument is missing.  I also can't figure out where the extension is meant to be saving this stuff.  Would be nice if there was a .json file or something to look at to see what's going on.

I should probably also note that upon creating a new project there are no CMake arguments.  After my item gets deleted, any arguments I've added get removed and instead a BOARD_ROOT item is added.

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