Backends don't work with simple setup when sample sequentially

Questions
2

Yep, I can confirm it is a bug - seems to related to when sampling multiple chains sequentially. Could you please open an issue?

Also, small tips:

  • n_init=1000 is not doing anything here - it is related to another initialization setup. You should instead use tune=1000 for tunning
  • you dont need both cores and njobs. If you are on master use cores. And if you want to sample from one chain only set chains=1