UPDATE 26/3/21: As promised, Ubisoft has issued a further hotfix to address issues introduced with the start of Assassin's Creed Valhalla's Ostara festival. This will re-enable decorations, and allow you to complete the Easter-like event's quests.
ORIGINAL STORY 21/3/21: Ubisoft has removed newly-added decorations and quests from Assassin's Creed Valhalla after the content caused players' systems to crash.
Ostara Festival arrived in Ravensthorpe earlier this week as part of Valhalla's seasonal free content. Running until 8th April, it features the return of drinking, archery and fighting mini-games and three new questlines let Eivor go egg hunting, fight off night spirits, and become a May Queen, but it's the new settlement decorations that are causing a little trouble.