I think that bug happens when version v0.18.0 or v0.18.1 is patced to v0.19.1 with HH v0.18+ > v0.19.1 PC Patch
It still says above on this page that patch applies to v0.18.0 or later, but it only works for patching v0.18.2 to v0.19.1.
For original poster: If my guess is correct, you can fix your setup by getting the HH v0.17+ > v0.18.2 PC Patch and copying only the garden.rpa file from that. Or installing the full v0.19.1 like developer suggested, but that is 13GB download instead of 1GB.
just getting a whole new error now