Anim notification not triggered on device

I got some anim montages with two anim notifies each. Im facing the problem that only the first triggers. This happens on device and even in the mobile preview (pc works as expected).
Are there some limitations,bugs or workaround of which I should know ?

a quick update here.

after a short debug session it looks like the problem happens if i increase the end of the animation and the missing notification is somewhere between the default end and the new end. more infos soon :wink: