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If you search for Descenders on your profile it shows up (filters are disabled when searching). It's probably because you have "Hide games with no hours played" filter enabled.
Unfortunately, it's an Xbox issue and nothing to do with the site so I can't fix it. But you should be able to make the game appear by disabling the hours filter.
Some games do not support play time tracking at all (regardless of the recent Xbox Live issues) so those are excluded from the filter
To avoid confusion I might just make the filter apply only to Steam given how inconsistent Xbox has gotten with the playtime tracking. In the beginning, almost all Xbox One games supported it.