Seen it in multiple matches where random players are 10+ levels higher than everyone else because their artifact power is still enabled. Is this a confirmed visual glitch?
Btw, I play at 1053 (artifact disabled) and have ran into players at 1070 who still have their artifact enabled showing a +15 artifact lvl.
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There is a bug where the artifact power is enabled. Bungie knows about it and it is a low priority for them.