How can I know that the "Awaiting state lifecycle" is over

[just-website]

Deck ver. 9.0.35
I use deck and Mapbox Overlay.
I want to bind my app strore state and inner state deckGL as early as possible.
I try to call myCompositeLayer.setState(newState) inside map.onLoad callback. And even though the Deck layers are ready, I get an error 'Cannot convert undefined or null to object'. As I see it, this is because the internal _initialize() method has not yet been called from the LayerManager.
Is there an event after which layer.setState() can be called the first time?

[Pessimistress]

layer.setState is not supposed to be called from outside of the layer (unless you know what you are doing).