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In an older thread I reported Gasparov not recognising my investors' fully satiated champagne need, but it seems to have went nowhere while the majority of other bugs have been resolved. Now In a new playthrough started from scratch with the latest patches and DLC (apart from Sunken Treasure which was not activated), the quest bugged again but in a different form: This time I have no investors at all, which means there should not be any champagne demand. Gasparov nevertheless gave me the quest and somehow claims I have fulfilled 4% out of total champagne need. What I actually had was 4 tons of champagne in the warehouse, transported there from another island's carnival. There was more but some was given away to another quest, might be Gasparov's as well.
I suspected the quest tracked the champagne stock instead of need fulfilment but it wouldn't make sense in the older case as I definitely had more than 0 tons of champagne in my warehouse back then. Nevertheless, a screenshot and savefile is attached below:
https://mega.nz/file/3OwD3ShY#N8gEd4OfNHj77tXlqPDfWdSIMHLGviR1wotTl7Fn5c8
On a side note, von Malching once gave me a delivery/pick up quest in the North Pole during the same playthrough but after I hit accept his clipper immediately sailed away and I don't even know what happened. No quest log or pop up dialogue, couldn't remember if there is any monetary or standing change either. No screenshot or save can be provided because there was no previous save kept where it can be replicated immediately.