No directive is matched on attribute ngFor

Hello,

I get "No directive is matched on attribute ngFor" including missing type for iteration variable, which is the real showstopper (no autocompletion etc).

ng serve / ng build work as expected (so does the actual iteration at runtime).

If I forgot something, please ask :-)

Thanks in advance.

What I tried and did not work:

• Reinstalled node (with apt from deb https://deb.nodesource.com/node_14.x hirsute main)
• Reinstalled angular/cli (sudo npm install -g angular-cli)
• Installed angular/cli locally (not globally)
• Invalidated Idea Caches
• Mark directory as "NOT EXCLUDED": node_modules/@angular
• Imported CommonModule in app.module.ts (in imports)

Steps to reproduce are:

ng new angular

app.component.ts

import {Component} from '@angular/core';

export class X {
  a: number = 5;

  constructor(a: number) {
    this.a = a;
  }

}

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.less']
})
export class AppComponent {
  title = 'angular';

  xs: X[] = [new X(4)];

}

app.component.html

<div *ngFor="let x of xs">
  {{x.a}}
</div>

ng version

Angular CLI: 12.2.0
Node: 14.17.4
Package Manager: npm 6.14.14
OS: linux x64

Angular: 12.2.0
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1202.0
@angular-devkit/build-angular 12.2.0
@angular-devkit/core 12.2.0
@angular-devkit/schematics 12.2.0
@schematics/angular 12.2.0
rxjs 6.6.7
typescript 4.3.5

IDE version

IntelliJ IDEA 2020.1.4 (Ultimate Edition)
Build #IU-201.8743.12, built on July 21, 2020
Runtime version: 11.0.7+10-b765.65 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Linux 5.4.0-80-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 725M
Cores: 8
Non-Bundled Plugins: Lombook Plugin
Current Desktop: MATE

cat /etc/lsb-release

DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=20.2
DISTRIB_CODENAME=uma
DISTRIB_DESCRIPTION="Linux Mint 20.2 Uma"