Bizarre this regression, i have been using PI with kodi and 3D files since a very very long time
I don't think it's a regression. 3D has never worked on the Pi4 builds.....yet. It does still work on the Pi3 though. You just can't get 4K, HD audio etc that the the Pi4 is capable of.
I too, am waiting anxiously for this feature for the Pi4 builds!