Here’s an unlisted video: https://vimeo.com/795669787/0763fdb816
If I try to just paste the URL on a line of its own, to embed it, the video apparently does not exist 
This used to work just fine - unsure when it broke - maybe Vimeo have changed something?
For reference, using the embed code from Vimeo does work (albeit in a tiny, horrible iframe):
But native one boxing of unlisted videos is kaput 
Hmm, it looks like the URL is truncated:
This URL format with a second hash seems related to unlisted videos.
From what I see there, it doesn’t seem to handle this situation:
~~https://github.com/discourse/onebox/blob/main/lib/onebox/engine/vimeo_onebox.rb~~
It might be a solution to rely on the uri value from the oembed_data output. Even with the video ID only, it gives /videos/795669787:0763fdb816, then you sub : character to /.
EDIT: Sorry did not pay attention I was looking at the old repo 
Hi @Richie, thanks for reporting this one. This was due to a change we made recently on how we handle some embeds. We just merged a fix for it here:
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