Safari on Big Sur won't load local files

[Mr. Awesome]

When I attempt to open a .html file from my hard drive in Safari, it fails with this error:
The operation couldn't be completed. (kCFErrorDomainCFNetwork error 1.) (kCFErrordomainCFNetwork:1)
Anyone have an idea of why? It didn't happen until I upgraded to Big Sur. Catalina worked just fine.

 

[Contact_Feanor]

Hey, I'm having the same error with safari 14 beta for Catalina. Two things that seem to "solve" it (either will do), but are an annoying workaround are:

• Remove the developer menu in safari preferences => then it works everywhere
or
• put the local html files you want to open in the applications folder => those html files will open even if you have the developer menu in your menu bar