Has the issue of syncing the RBS50Y to a RBS850 been resolved yet?

I am looking to add a 3rd Satellite to my AX6000 system (RBR850 Router).  The coverage is primarly outside area of the house.  I found the product sheet for the RBS50Y satellite unit, however, it appears that the router is not syncing with this satellite and it was to be fixed in Jan 2020.  Again, the comments seem to say that in April 2020 it was still not work.  Does anyone know if this is working at this point.  I would consider another RBS850 satellite unit, however, they are not available as a single unit purchase (it appears).