It seems in the Indian tradition. Jnana and Dhyana is two different things. So have the Pali text make this different tradition correctly in suttas. Maybe they mixed it up?
Jnana seems those that all can achieve in other sects. And Dhyana for the formless states. But I was worried that somewhere in sutta its mixed up.
One good example is the Jhana monks maybe was correctly Jnana monks. Since those are the seclusion states.