Everytime a Public Event Starts in the area where you can fish, the fishing area disappears and doesn't come back immediately. Most of the time, I have to go to transmat to the Tower, come back and try to get an instance where it's available. Please, Bungie, I beg of you, let me fish in peace!!!
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I’m guessing that bungie “coded” fishing essentially as a public event, so it can’t coexist with the other ones. Just my theory.