Another update:
While installing the 3.2.0-alpha.4 version of @jsonforms/angular-material I got a dependency error:
npm WARN ERESOLVE overriding peer dependency
npm WARN While resolving: @jsonforms/angular-material@3.2.0-alpha.4
npm WARN Found: @jsonforms/angular-test@undefined
npm WARN node_modules/@jsonforms/angular-test
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer @jsonforms/angular-test@"^3.2.0-alpha.3" from @jsonforms/angular-material@3.2.0-alpha.4
npm WARN node_modules/@jsonforms/angular-material
npm WARN @jsonforms/angular-material@"3.2.0-alpha.4" from the root project
npm ERR! code E404
npm ERR! 404 Not Found - GET https://registry.npmjs.org/@jsonforms%2fangular-test - Not found
npm ERR! 404
npm ERR! 404 '@jsonforms/angular-test@^3.2.0-alpha.3' is not in this registry.
npm ERR! 404
Looks like a similar issue to this post. I haven’t been able to find that package anywhere in any version. I’ll try some other things.