After upgrading an nx workspace to v12, everything works as before, expected template linted in the IDE.
The IDE (WebStorm) shows some strange errors never happend before:

The first warning says No directive is matched on attribute ngIf even the CommonModule is imported, the second error related to the async says Missing require() statement and var async = require('@angular/core/testing').async;
It's really interesting, because building the whole monorepo works flawlessly so I guess this could be caused by some incorrect linting configuration. Have to say that the workspace was not just updated to the newest nx version, It was converted from tslint to eslint as well.
Did someone had similar issues in the past?