Does this kind of stuff happen a lot

Sure, because they include people without power meters on leaderboards. It’s silly but ignoring those riders (or ignoring leaderboards) is the only option.

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I noticed they most always appear with no name and are usually labeled as .

I could be wrong, but I think the “.” is shown whenever a rider’s name consists of non-latin letters. I ride in the evening CST which is the morning for Korea and Japan and see a few .'s here and there.

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Is this Innsbruck?

Because there has been a bug in Zwift for years (maybe it has always been there since 2018) where some people get a time on the full UCI lap without actually doing the full UCI lap.