I want to share common dependencies in a micro-frontend project using single-spa/single-spa-angular. When trying to share @esm-bundle/angular__core, the console shows the following error:

MWE: https://github.com/SebastianOltmanns/singlespa-angular-core-share-dep
My minimal working example has three projects:
- root, the root-config, where the systemJS import-map is loaded and the micro-frontend services are loaded
- p1, basic angular example project, where
@angular/core is externalized
- p2, basic angular example project, where
@angular/core is included
When running all three projects, visiting p1 gives the error shown above, but visiting p2 works. The literal only difference in p1 and p2 is in externalizing the @angular/core library, and instead using @esm-bundle/angular__core. This is why I open this issue here, because I think it has to do with this project.
Thanks for any help or investigations!