It looks like granite/ui/components/foundation/include defined as sling:resourceType in /libs/wcm/foundation/components/page/cq:dialog/content/items/tabs/items/basic breaks the Sling Resource Merger mechanism.
For example it is no longer possible to add additional fields under the basic tab when extending /libs/wcm/foundation/components/page.
Can you please verify and confirm that it is the same on your side?
Cheers,
Nono
