When navigation is set to "none", a TouchWrapper within a Pager does not send a UserEvent anymore. This worked until January because I exhaustively tested it on device, so I think it may be a side effect of this update:
Please note that when testing on simulator, UserEvents are correctly sent, so this is a device-related issue.
Moreover, a TouchWrapper inside the first displayed page of a Pager does not send a UserEvent, whatever is the Pager navigation state (I tried all values). Instead, the device builtin behaviour is observed (https://forums.developer.amazon.com/questions/198394/touching-screen-pauses-skill.html). Please note that TouchWrappers work for subsequent pages reached through a setPage command.
In this second case, simulator behaves the same (no UserEvents are sent for the first page).