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Is this the way Ubisoft repaired MEGAbug in game? Quest deleted (the wisdom therein), unfinished, library not excavated, nothing can be done with it anymore 
thank you for reporting this issue.
Could you please forward us your savegame for investigation?
You can find it in Documents\Anno 1800\accounts\ACCOUNT ID\PLAYER NAME
You'd then need to upload it on a platform of your choice and send me the download link, either by posting it here on the forums or - if you prefer - via direct message.
Thank you
