The new occurrence model, based on adam()

[config-i1]

This should call for adam() with distribution="plogis" and use a built-in mechanism of update of states.

The main issue is with occurrence="general", which relies on a completely different stuff...

[config-i1]

After careful consideration, distribution="plogis" does not make much sense in adam() due to many differences between the models. So, better create a separate function oadam() by copy-pasting the original code and then modifying it.