With aframe master and the index.html in the repo
we get
component.js:367 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'schemaChange')
at n.updateComponent (component.js:367:30)
at n.updateProperties (component.js:297:12)
at a.updateComponent (a-entity.js:466:17)
at a.updateComponents (a-entity.js:442:12)
at a-entity.js:243:12
at a-node.js:149:17
and background is black, not sure if this is related.
Also environment component needs to be updated to 1.3.3.