Huawei Watch build MEC23L, Huawei GX8 rooted CM13, WatchMaker 3.9.9d.
I had on my watch the games Lifeline, Lifeline 2, and Lifeline: Silent Night - choosing a watch app to launch on tap left a list that stopped at Lifeline 2.
Uninstalled Lifeline: Silent Night - the problem went away and the complete list appeared. It's repeatable.