It's part of the BB, not sure what is is used for though...
It's bizarre, on this other one I have it appears to sit above the tapers, but there's no way that's happening here. There's a lip above the tapers where it's 17mm. Washer is no bigger than 16.6mm. I'll live without it until the BB fails I guess.
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Your second photo is what I'm expecting, have used UN55 for a lot of my builds and yeah the ring sits on the axle.
I'll keep an eye and check for movement or play every now and then.
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It's part of the BB, not sure what is is used for though...