After an Angular 11 update, the code:

<markdown
[data]=“model.someText”></markdown>

would throw an exception “Can’t bind to ‘data’ since it isn’t a known property of ‘markdown'” only in production builds.

Fixed this by adding

@NgModule({

  ...

  imports: [

    ...

    ...

                MarkdownModule.forRoot(),

  ],

  ...

})

export class AppModule {}

In the AppModule en in de Module containing the component with the template using the “markdown” tag, added:

@NgModule({

  ...

  imports: [

    ...

                , MarkdownModule.forChild()
                

  ],

  ...

})

export class CoreModule { }