No provider for _LeafletDirective after upgrade from Angular 16 to 18

[bmulder-innoseis]

I've updated Angular to v17 and then v18, and then updated ngx-leaflet and ngx-leaflet-markercluster to their latest versions.
Now, when I try to show a map in the browser, it is blank and I get the following error in the console:

ERROR NullInjectorError: R3InjectorError(_AppModule)[_LeafletDirective -> _LeafletDirective]:
NullInjectorError: No provider for _LeafletDirective!

It used to be working, and I have LeafletDirective declared and imported as provider in my app.module.ts

My qc-map.component.html contains the following at the lines at which the error occurs:

<div leaflet app-map1 [leafletOptions]="options"
		[leafletBaseLayers]="baseLayers" [leafletLayersControlOptions]="layersControlOptions"
		[leafletMarkerCluster]="markers" [leafletMarkerClusterOptions]="markerClusterOptions"
		(leafletMarkerClusterReady)="markerClusterReady($event)" (leafletMapReady)="onMapReady($event)"
		(leafletZoomChange)="mapZoomed($event)" (leafletCenterChange)="mapMoved($event)"
		(leafletClick)="onMapClicked()">
</div>	

Any clues to what's wrong?

[bmulder-innoseis]

I tried downgrading to v17, and it does not occur there. The issue seems to be with v18