I'm facing a glitch that is preventing me continuing the story on the Bloody Path to Peace quest. When I go to find Ceolbert, I'm being transported inside of the cave before fighting the wolves.

When playing I walk into the cave, Eivor comments on the blood and the camera swoops into the wall (which are white, then load their textures) before showing a bloody patch and then loading the cave with the body. I can't progress because the moveable rock, is pushed up against the wall and when I try to make Eivor climb, she gets stranded in mid-air and then dies. I can hear the wolves outside, so something has caused the game to skip this encounter.

I have a manual save from before going in, so I'm able to escape that way since all my autosaves are now from within the cave. However, this means I can't continue to the story, as I get the same error each time.

I also can't update the game due to a PS5 error I'm receiving - error ce-34878-0.

I snuck in to a monastery, from on land and Assassinated, almost half the town before I used the horn and started the raid.
Barging the first door, a civilian came and help. Which worked great for 2 doors and 2 chests.
The last chest I could not get any help for.
So I went looking. The crew were fighting with arrows, the troops on the land. From the longship
I swam out the the longship, backed up and the then used the "Raid" option. NO luck.
I then backed the longship further. No Luck.
I had to kill all the enemy soldiers they were engaged with. And back the longship a long way away and wait for the OAR animation and then speed into the Raid area.
The crew unloaded, and at this stage all the soldiers of the town were already dead by my hand.
I then was finally able to reach the last assist door and chest.

It makes me ask. What is the horn for? If the crew will always arrive via the raid zone, and the not the gate you are standing in ? And then why did they stay in the longship?