Hi there and welcome
Can you tell me please what you mean with Jump List?
Thanks for that and yes it should have been left in, but it not currently in this build. We are only technical support here, I cannot say sorry why they choose to not add it in this release. But based on past experiences, they would have had a problem with it in the official release so have left it out for now.
I cannot say Why someone at Microsoft in the developers group has not implemented it yet, only that it will be released in a future update.
Feel free to ask please if you would like any additional information please.