When a Shortcut key is bound to a mouse button, trying to assign a build menu item to the hotbar does not work.
For context, I have an MMO mouse with an array of buttons on the side. These buttons correspond to the 1 through 9 keys on my keyboard, except for the buttons for 1 and 6. Because of the position of these buttons on the mouse, I have them set to Mouse Forward and Mouse Back (labeled Thumb Mouse Button and Thumb Mouse Button 2 in game). So I have Shortcut1 bound to Thumb Mouse Button 2, and Shortcut6 bound to Thumb Mouse Button. When I have an item in those slots in my hotbar, pressing the button pulls up the builder as expected. However, when I am in the build menu and want to reassign the item that is on the hotbar, Shortcut1 and Shortcut6 do nothing. If I want to change those respective items in my hotbar, I have to change the keybindings to something else, do the hotbar assignment, and then change the keybindings back to the thumb mouse buttons.