David. I have noticed that it is only the groups in Phoscon that actually have lights below them that gets imported into Home Assistant. I have many auto generated groups in Phoscon that get created when you add remote controls. I guess the idea is that you can then easily add lights to the new remote. I never used this feature. Instead if manually created groups and added lights to them and I do all control from Home Assistant. The only reason I create Deconz groups is to enable smooth increase and decrease like I have descibed here
So I had one group for every room in my house - total of 7 or 8 that I had to fix.
With Robban’s work around you can now…
If you did not already upgrade to 0.104 - then simply follow Robban’s JSON file hack. It is much less steps and less risk of messing up
If you did the upgrade and have a recent snapshot - then roll back to the snapshot - do the file hack with Home Assistant stopped - then restart Home Assistant and do a normal upgrade
If you do not have a recent backup and you upgraded then you have to do all my steps. Or remove the deconz integration completely and start over again. That may be much harder because you probably did some renaming and tweaks you have forgotten about.