reproduction steps (not sure if 5/5)
* have some sun flares in your town, dont pick them up
* go to neighbour city and do neighbourly help
* chest should appear
* look around the map, notice a sunflare in neighbourly town (at a location that was in your town aswell)
* try clicking it, notice nothing happens.
* dont open the help chest (for second part of bug) and go back to your city
* go to location where you saw the sunflare with neighbour.
* collect it and notice the sunflare stays there. collect it again and notice nothing happens (bug part 1)
* go to other neighbours
* get a chest from nh but dont open it
* continue doing neighbourly help untill you get chest again.
* try clicking it and notice you cant open it up.