This breaks generating update files for core via eg ./console generate:update --component=core which it is mostly used for I'd say.

I'd undo that change and instead in GenerateUpdate remove

        if ($component !== 'core') {
            $className .= '\Updates';
        }

Which should work

@tsteur sounds good to me - maybe double check that it works for generate:update for a plugin, or let me know when it's done and i'll check

fixed it here #10456