@martijnP Here is a fixed version of the asset, that you can use until it is fixed in the data base. Just go to the Asset Browser, choose "Import Assets" from the Create menu, select the zip file (no need to unzip) and choose "Preferences" as your database (or any other db if you have created any). After that your scene file should load with the fixed version of the asset. If not, select the Greeble Assert in the Object Manager, go to the Basic tab and set the Asset Version to either "Latest" or the newest in the dropdown.
Greeble_fix.zip