Just wanted to put this out there: I was running Polysemy/Riven's Lair and during the final damage phase of the final boss, either myself or an ally got hit with detain while we were right next to each other. We were both trapped within the sphere, but once it was broken, I still had the detain buff. It lasted until the activity ended, and I couldn't reach the rewards chest.
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Hello there, Thank you for reporting. We are actively investigating an issue where rewards are not consistently dropping for players completing the Riven's Lair seasonal activity.