Adding to the post before about the game not loading, it appears to be related to having modules selected for the project. If you select classic then it works, but otherwise you get
Uncaught TypeError: Cannot read property 'Plugins' of undefined
at c3runtime.js:2563
c3runtime.js:2322 Uncaught (in promise) TypeError: self.C3_GetObjectRefTable is not a function
at C3Runtime._LoadDataJson (c3runtime.js:2322)
at C3Runtime.Init (c3runtime.js:2316)
at async RuntimeInterface._InitDOM (main.js:39)
at async RuntimeInterface._Init (main.js:27)