I also have this bug playing on Game Pass for PC. I’ve been through all civs multiple times, built all of the wonders in each age (even all of the standard buildings for each civ in each age, phew!), tried all of the suggestions from the forums, and I’m still stuck at 98%. I noticed that a few people have said that after buying the USA DLC and building the saloon it unlocked for them, and the saloon from the base game is now the ‘tavern’, could this be linked to the issue?