Bulk publish (from collection view or publish with descendants) seems to not include items in DeliveryApiContentIndex

We’re running an Umbraco instance on Umbraco Cloud and we’re running the latest version of Umbraco (16.1.1)

I’m working on a content migration for a client of ours. I have added 250+ news pages via the management api. Afterwards I’ve published the news pages in bulk (as I don’t want to publish them one by one). It seems as if the publish in bulk does not trigger the items to be added to the DeliveryApiContentIndex. I’ve tried publishing from the collection view (100 items per publish) and I’ve tried to publish with descendants, but both methods do not seem to trigger the item to be added to the content delivery index.

As a side-note: I received no errors when publishing in bulk.

Has anyone had this issue before?

Thanks in advance!