Hi! Yes the problem still exists. I am on the beta 3.70~61. All my relay-equipped Shelly devices are discovered properly, but PM models which only measure power/energy are not found. There is no password protection on any of my Shellys.
Ideally I would like to assign a heat pump role to two of my shelly units (non-relay models, on purpose). Perhaps in the future this could help DESS prediction accuracy.