My showcase game hangs, but the same zip file runs on itch

I submitted our game (Cascadia 9.0) to the October showcase. When I try to play it, the loading bar instantly goes to 90% and then hangs there. This is odd because the same zip file plays just fine on itch.io:

https://peterdrake.itch.io/cascadia90

What can I do?

 

It may help to reset the browser cache.

 

Nope, I cleared all of the cache related to Unity and have the same result. (Someone else also got this.)

 

It looks like the file is somehow not on the server. From the Chrome browser console:

q1.loader.js:1 Unable to load file https://play-static.unity.com/20221010/webgl/cbdab7fc-8def-4d41-9ae9-72b136927908/Build/! Check that the file exists on the remote server. (also check browser Console and Devtools Network tab to debug)
n @ q1.loader.js:1
play-static.unity.com/20221010/webgl/cbdab7fc-8def-4d41-9ae9-72b136927908/Build/:1 Failed to load resource: the server responded with a status of 404 (Not Found)

 

is that an exclamation mark?
check your assets if they have any invalid URL characters in them

 

The exclamation point is part of the error message, not something in my file paths.