我猜你在骨架中隐藏了骨骼，或者你使用了皮肤骨骼并在树状视图设置中启用了Hide viewport skin bones(隐藏视口皮肤骨骼)。如果一个骨头不可见，那么在层级树视图或曲线图中，该骨头的时间线将被隐藏，键也将被隐藏。
关于 Hide viewport skin bones(隐藏视口皮肤骨骼)的更多信息，请看这个页面。
层级树视图 - Spine用户指南: 隐藏视口皮肤骨骼
I guess you have hidden bones in your skeleton or you are using skin bones and setting enable Hide viewport skin bones in the Tree view settings. If a bone is not visible, the timeline for that bone will be hidden in the Dopesheet view or Graph view, and the keys will be hidden as well.
For more information about Hide viewport skin bones, please see this page:
层级树视图 - Spine用户指南: 隐藏视口皮肤骨骼
