I have a next layout configuration:
CoordinatorLayout
AppbarLayout
RecyclerView
RecyclerView has a first item which is horizontal RecyclerView.
When i scroll down till horizontal Recycler fully dissapears and then i scroll up till it becomes fully visible and try to scroll or tap on it it's not scroll nor receives any touch events at the first time. But next time it works as intended.
I suppose that something is intercepting touch events.
Here is test project
https://github.com/outofdate/recyclertest
EDITED
Found how to fix https://gist.github.com/chrisbanes/8391b5adb9ee42180893300850ed02f2