@ubi-borealis I am opening this topic at the suggestion of @ubi-borealis.
I originally posted this bug under "Game completion is stuck and does not reach 100%" = https://discussions.ubisoft.com/topic/85605/game-completion-is-stuck-and-does-not-reach-100-post-here
Playing on XBOX ONE.
Back between my saves of "November 20, 2020 - 11:29PM Manual Save" and "November 25, 2020- 2:03AM Manual Save" I was wandering around East Anglia finding all of the Wealth, Mysteries and Artifacts.
When I got to Edmund's Hope, I went through all of the steps to get to the chest and when I opened it, I quickly turned around and headed to the door because I thought I heard something and thought I was being attacked. I did not see the normal popup indicating I received the Hoard Map but I did see it in my inventory. I went to the place on the map where I found the Snakebite (Tailpiece) Scheme, which in in the Longship Customization Options.
BUT... The fact that I found and received the Edmund's Hope Hoard Map, it did not register on the East Anglia Map Area Completion Chart as a found Artifact (I check the chart each time I complete something). The "X" was placed on the map but the completion chart was not updated. Even though I have since found/completed everything in East Anglia, it still indicates that I have one Artifact to find. I even compared my map to various completion guides posted on various websites (thank you to those of you who take the time to do that). I not only compared the map, I literally went to every location to verify I actually did find the Artifact.
This has not happened to me since Edmund's Hope (and did not before then) because I let the find register before doing anything else.
I did not report this when it happened because, quite honestly, I never reported anything before and was not sure how. I figured "I can't be the only one" and someone else will report it and eventually the developers will write a startup subroutine that would compare the map area completion chart data with the map "X" marks the spot map data and with the actual acquisition data and resolve the missing elements.
But after the "Assassin's Creed Valhalla - Title Update 1.1.2" and the problems it caused with my favorite default BOW - Spartan Bow - and I decided that I won't be playing this game again until all of those problems are resolved, I decided to learn how use this forum. My first post was about the Spartan Bow back in that thread. I noticed that no one (that I could find) has reported anything like this, so I figured I should post this.