Community pages return a 404 after changing the base slug

This is the answer I wish I had found six months ago. Would have saved me a weekend of trial and error.

I respectfully disagree on one detail. In my setup the opposite held true, though I suspect it comes down to community size.

Tried this on a staging copy first and it behaved exactly as described. Confident enough to roll it to production now.

Appreciate the clear steps. The dry-run tip in particular saved me from a mistake I would not have caught otherwise.

Could you say more about how you measured the result? I want to try this but I am not sure what success would look like.