Code entering/exiting a playable behaviour on the graph?

I'm trying a simple experiment with Timeline. I have custom classes inheriting from PlayableBehaviour/PlayableAsset and I want to fire off code when entering and exiting them when playing the graph. Is there no straight forward way to do that? (I don't want to use signals for various reasons).

Using OnBehaviourPlay / OnBehaviourPause sorta works but they also get called a number of other times. OnBehaviourPlay also does not get called when a behavior is on frame 0. I can correct that by starting everything on frame 1 but that is asking for bugs.

For visual aid


I have debug events on OnBehaviourPlay / OnBehaviourPause. When I play I would expect to get 1 play, 1 pause, 2 play, 2 pause, 3 play, 3 pause.
Instead I get (nothing).. 1 pause, 2 play, 2 pause, 3 play, 3 pause, 1 pause

How can I get simple enter/exits?

edit: It's also possible all of this is goofy because of the editor. Like any time I click on the gameobject with a director I get the OnGraphStart events for everything. When it finishes playing it also does the OnGraphStop and OnGraphStart events back to back. If it's more consistent when compiled that will still make it a pain to develop.

edit2: figured out my Marker issue. It was a serializable problem. Markers + events seem more consistent than playables but they are harder to position. I kinda wanted events that couldn't overlap but maybe I'll put up with markers as they are.

 

So markers will always get triggered even if timeline starts skipping due to low fps?

 

Is there a way to get the marker to run its own code when triggered? (not require a listener to receive anything)