fix routes manifest, suppress duplicates showing

[hasty perch]

This was fixed previously, but has regressed sometime ago. I thought now you guys are back making releases I'd bring this up.

https://github.com/blitz-js/blitz/pull/3531

Any chance you could add this to your to-do list to resolve? Thanks!

[tired ingot]

Noticed this as well. I've just been patching that console log myself for now

[wicked tide]

Hmm, that's weird, we haven't done any changes to this part of the codebase recently. @cosmic flint do you recall anything?