so I turned down the fishing request originally beacuse I didn't realize that but now it simply not there at all
oh, you straight up told him no immediately, i'll ask Caro on the discord server to check the ectoplasm way then... but he likely won't update for a while, i think you should just restart the game, hold ctrl to skip dialogues and maybe use easy mode, it shouldn't take long since that is still arc I stuff.
i can throw a bone(r) by reassuring you about there not being cases of failing quests (as of 0.34), even if you may not be able to do a few for a while, you can always go back for them later (except the "auction", but that one tells you how much time you have very clearly), very unfortunate this one broke and just happens to not be completable if you say no to Snow now.