I have the video uploading now and will be more than happy to show it.
We finally, after about 50+ gambit matches, got the riven to spawn. WE burned it down and killed it but the enemy team got the win with yellow still in the primeval health bar. I don’t mind the RNG grind but don’t cheat me out of it when I’ve clearly earned it. This is absolutely atrocious and is COMPLETELY unacceptable.
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Known issue, they are working on it