The delivery of the most recent HRDF data was too late, which also resulted in a delay in the GTFS-Static and thus in the switch of GTFS-Realtime to the latest data.
The latest HRDF data is now available, with further updates to follow.
Update: GTFS-Static will only be available after 1pm, meaning GTFS-RT will not be activated until tomorrow 2025-06-06.
Update II: GTFS-RT now references the latest GTFS-S delivery.
Cookbook: HRDF, GTFS-Static & GTFS Realtime (GTFS-RT)