I would guess permissions to that folder have been borked somehow.

When I looked the other day, Deno Deploy was hosting 46 websites, I tried a few but they all worked so I didn't land on your site.

As for a silent response, I've seen similar trying to mirror where what I'm using doesn't have the correct or necessary permissions or settings.

I'd suggest you contact Deno Deploy to find out why your redirect isn't working.

I already did but as I have the free tier, I am still waiting for a reply as of today :-)