Co op ark chest bug And frustration.

Yeah it doesn't seem it happens on Xbox, but is definitely happening on PS4

Had this happen to me Sunday I think it was..might have been Saturday too...

I joined a Scrapworks co-op late (they were at the boss fight). I changed my class mid-fight...I did not get final hit, but the chests glitched out for me, and no matter what I could do I was unable to use my key.

Only other situations I had chests glitch was Motherlode before Trouble in Paradise update, and maybe Soleptor Excavation. Scrapworks I've had glitch on me like 3 times max, but it does get irritating when this happens.

Try doing the entire coop without changing your class,
See if it works for you, it definitely did it for me. Good Luck

They brought up this issue during one of the twitch sessions. It's got to do with whomever hit the boss last or something. I never change classes when fighting boss (nor anytime during co-op) and it still happens sometimes.

Miller Time, I think you’re on to something. The box ONLY bugs out when changing class. I didn’t change the loadout because that’s already bugged. All I did was change the class. Additionally, I did NOT have the final hit. In fact, I had just grabbed ammo and turned around to shoot when the boss died. This has happened mostly in scrapworks and once or twice in the soleptor coop. It’s just really frustration to play the entire instance just to get to the end and not get the rewards.

Also, in regards to turkey gun. I don’t spam it. I used it on the nano scrappers and on the forges. That’s it. The rest of the time I used a blast rifle.

Glad it work out for you, pass the word around, and good luck with the prototype you going to need it.