@asmecher The error log looks much happier
[14-May-2020 09:04:06 Australia/Melbourne] WARNING: The NavigationMenu (ContextId: 1, Title: User Navigation Menu, Area: user) will be skipped because the specified area has already a NavigationMenu attached.
[14-May-2020 09:04:06 Australia/Melbourne] WARNING: The NavigationMenu (ContextId: 1, Title: Primary Navigation Menu, Area: primary) will be skipped because the specified area has already a NavigationMenu attached.
[14-May-2020 09:04:06 Australia/Melbourne] WARNING: The NavigationMenu (ContextId: 0, Title: User Navigation Menu, Area: user) will be skipped because the specified area has already a NavigationMenu attached.