Sometimes Siva offerings won't work even though they're in your inventory. Other times you'll activate them and nothing will happen and they will delete from your inventory.
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I think this update (2.4.1) for Archons Forge, only changes the light level rewards and nothing else. I seen this happen before this update. A bug with false event showing up everytime, and someone unable to use offering, I ran into this before. I think this bug may be started from the following: some player lagging, 2 or more use offering, and one or more player leaving the area, mostly 2 of theses or all 3 of these at the same time. The worst part is, it stays bugged out with a specific offering cannot be used, until your whole fireteam leaves the area and find a new Archons Forge instance, hoping that if players are in there already, this one isn't bugged out. Archons Forge have other issues which other users have listed them. https://www.bungie.net/en/Forums/Post/215941835