I have posted about this back in December, and had some communication from Ubisoft. However, there has still not been any form of resolution to this issue, other than to suggest starting the game right from the beginning, or from a previous save.
I have made a YouTube vide which shows this issue here

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As this is being played on XBox we have been advised that we cannot send over our game data to be looked at. My main query if there is nothing that can be done, is anything still being looked at to rectify this, as it has never appeared on the megathread as being looked at, and has not been resolved after numerous updates.

As a further suggestion, I am aware that AC hasn't had the option to restart missions since Origins, but based on the amount of niggly issues people clearly have with missions, would it not be the easiest fix to write this option into the code? It would then fix a huge amount of issues that people have, or at least give people the option to try it again to see if glitches get fixed before posting on this forum for help.

@ajuk1981 Also, if being able to start individual missions is too hard to do, how about the ability to restart a county from the beginning?

I'm sure there are many players who are in the same position as us whereby they have continued with other counties, missions whilst waiting for a resolution to their problem, and as such have completed way more of the game than justifies restarting from the beginning, or going back to save game from before the problem mission.

@ubi-keo Hello there, sorry for the delay in getting back to you.

Initially the cut scene played and the characters got on the horses and started riding. The game had autosaved already, and it was getting too late to carry on a new mission so after the save, quit to main menu and turned the machine off. When going back onto the game, it was like the videos show as if there is no mission there. The quest is no longer on the map. We have followed youTube videos showing the route taken, and followed them exactly in case we picked up the mission at a later point, but there is nothing. We have explored the entire castle, and the man on the floor doesn't have anything on him to collect.

On the quest log, the previous quest 'Pilgrimage to St Albans' is showing as completed, and underneath that there is a blank box as if this mission should be there.

There were no crashes, and the game had definitely finished saving as the logo in the corner had disappeared a few minutes before deciding to stop playing.

@ubi-litten Hi there,

Thank you for getting back in touch. I've gone in to have a look and can't see the empty boxes anymore. When we looked previously it was during a festival, so not sure if it was maybe missions relating to that.

Andrew