V2.1

It may be a mistake as they are working to get 2.5 experimental ready for release and may have accidentally removed that. Maybe ask in the support forum and see if TFP responds and perhaps fixes it.
 
To cross-post something I said on the Steam forum:

I don’t know about 2.1 specifically, but in general TFP are dealing with Steam’s limit on how many builds can be maintained in the betas list. So they’ve had to do some picking and choosing, and this phenomenon will likely continue to crop up as new builds are released.
 
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