Just going to stick these three bugs into one thread to save on space and not spam... but they are not related to each other and were done in a couple different play-throughs.
1)
Regarding the Zhent agents and the Gnoll cave: If you sneak around them from the tunnel behind and steal the chest, you can then open it and send everything to camp from the back of the cave, out of sight. This is fine, and you can save them and get a cool extra bit of interaction when you get to their hideout later in addition to the guy wondering where the chest got off to. However, despite talking to the leader and getting her approval to have the special items from Brem, if you then proceed to head to the back of the cave where the wolves are, everyone is flagged hostile and will attack on sight. I never told her anything about the chest and got paid for saving Rogun (the other guy died).
2)
Camping/long rest whilst in the Zhent cave: If you have yet to see the cutscene of
Wyll meeting with his patron in camp and being turned
and it triggers then, the Travellers Chest in camp will vanish and you cannot long rest (at least if all your items are stored there) or leave. I found I could still send items to camp, but the chest had vanished. It fixed itself from a quicksave & quickload, but just an odd little bug likely related to the cutscene wiping it out. No items were lost and everything was fine, but it ceased to exist for a bit there.
3)
Regarding the book, "The Great Furnace of Grymforge": On my playthrough with my second character, after the latest patch (not sure if related), the text is there twice. Hopefully not related to saves or anything as that was my second character to pick up the book.
I hope these are detailed enough to reproduce and fix!
