Summary
We have a limit in the backend to the amount of characters per navigation item. However, if we select a page to be added there and then change its title to something longer, the new title will show in the navigation regardless of the backend limit (see screenshot)
This is an edge case, but to be safe we should limit these items to 2 lines, with `...` for the overflow.
Make sure to apply this fix to the mobile navigation as well.