Indeed Studio One is pretty useless for Ambisonics.
It's also a big frustration for me, as a payed customer who also uses Ambisonics and the DearVR Plugins. If you limit your production to only stereo, then you can use it...
My advice is to use Pro-Tools or Reaper (good price!) instead, there you can use the proper 3D audio (multichannel) support we need.