When variables are completely missing, there’s an option in the context menu (right mouse button) to create the variable. This makes life easier than removing the node and creating a new one.
Also, the context menu can offer options named “refresh node” or similar, don’t remember how it exactly is called - this maybe helps with your MainMenu.
Not sure, if there’s some magic for refreshing everything. There exists a free plugin, but I did never use that one. So why not give it a try?
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