Investigating a report of a cutscene for the Objective Meridian flashpoint. I've discovered that the quest itself does no longer properly advance on the current build of the PTS.
Going through the entirely of the Onslaught expansion story on a Shadow Assassin on PTS, once on the story quest "Objective Meridian", you are supposed to be transitioning from one cutscene (taking place in orbit above Corellia) to another (landing on the surface, starting the flashpoint. This is the cutscene reportedly no longer playing) via a loading screen.
However, while the image of the loading screen indicates that the flashpoint is being loaded, the image will swap to that of the Republic Fleet as it finishes loading and the player is kicked back in front of the flashpoint door on the Republic Fleet. While the story quest will still say "Complete the "Objective Meridian" Flashpoint", the player is not given an actual flashpoint quest "[sOLO-STORY] Flashpoint: Objective Meridian".
The terminal that is close to the entrance and which is supposed to manually grant the Story/Veteran/Master mode difficulty quest is gone and the flashpoint will also not be available from the activity finder in any difficulty mode, as if the quests have accidentally been patched out. Resetting the story quest does nothing.
If this build goes to live servers the way it is currently on PTS, it will mean that the Onslaught expansion can no longer be completed.