Is there any official solution for this issue?
I am also encountering the problem of having 2 versions 'Ready For Sale' and cannot create a new one.
I had my latest release set to a 7 Day phased rollout but ended it early by hitting 'Release to All Users' and now are stuck with the 2 'Ready for Sale' versions.
Trying to trick below did not help as I was unable to save the changes after removing the first update from the last compatible version settings
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I can see from other posts that a number of people are experiencing this issue. Apologies for the duplicate thread.