I just discovered that you can’t change the URL slug for the Style Guide page without breaking the connection to the Relume-Webflow app. I shortened it to /style-guide - removed the string of long characters appending the slug. Apparently those characters are important!
I was freaking out for a bit before I figured out that I shouldn’t have altered the slug. Sharing my story here in case it isn’t common knowledge and maybe spare someone else the panic.