Error that Bagnon has been blocked from an action only available to the Blizzard UI. Happens anytime I right click on an inventory option to use it.

8x [ADDON_ACTION_FORBIDDEN] AddOn 'Bagnon' tried to call the protected function 'UNKNOWN()'.
[string "@!BugGrabber/BugGrabber.lua"]:480: in function <!BugGrabber/BugGrabber.lua:480>
[string "=[C]"]: ?
[string "=[C]"]: in function UseContainerItem' [string "@FrameXML/ContainerFrame.lua"]:1409: in function <FrameXML/ContainerFrame.lua:1318> [string "=[C]"]: in function ContainerFrameItemButton_OnClick'
[string "@FrameXML/ContainerFrame.lua"]:1461: in function <FrameXML/ContainerFrame.lua:1448>

This seems similar to the issues mentioned in #1542.

You are definitely correct: the issue is still happening. Apparently, I didn't fully test...

I backrevved to 10.0.13, and this issue isn't happening there.

I changed the code that was presented in 1542, didn't seem to work. I'll try the backing

Tried 3 or 4 different back versions, including the one you mentioned, still happening :-(