Kind of expected something like this to happen eventually, unannounced projects are cancelled all the time, we don't hear about it, because they're unannounced. Xbox has really got to fix its leak issue when they have leakers leaking titles which haven't even enter Pre-Production yet and are just a codename, leaking stuff the moment they sign the contract, Lmao.
You should be prepared for this to potentially happen again to one of the dozen of unannounced projects and I know it's less Xbox's fault but people aren't going to stop leaking this stuff so Xbox should absolutely fix their leak issue because it creates unnecessary negative news which wouldn't have existed otherwise.