Nova named routes not found after updating to 3.31

I updated to Nova 3.31 in the usual way (download the archive, move it into place (replacing the old copy), run the publish task, clear view and route caches), but now I get blade errors saying it can't find named Nova routes (such as nova.index). I can see the Nova routes in route:list, including their names. I do have the service provider listed in my config/app.php file. This is only a problem where I use named routes, because the actual Nova interface works fine, it's things like <x-nav-link :href="route('nova.index')"> that are failing.

What could the cause of that be?