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Somehow we are missing this.
Probably due to generics limitation or failed recursive generic argument resolution (bug).
I believe this was fixed awhile back, I see a "ConcurrentSkipListMap" in the most recent stable version of Xamarin.Android:
[Register("java/util/concurrent/ConcurrentSkipListMap", DoNotGenerateAcw = true, ApiSince = 9)]
Xamarin.Android SDK 126.96.36.199
Thus marking this bug as RESOLVED FIXED for the time being as I was able to verify this is available.