Starting beta 3, my first research was harvesting. Used custom kingdom civ. Upon completion, my existing garden vanished with no replacement (both 2d and 3d maps), and the food it had been producing was gone. Additionally, buildings which had been connected to my city through the garden are no longer enclosed in my fenceline.
A turn later, the food bonus returns, but the location is still vacant, and I cannot build a new garden.

Test system:
q9450
4GB (2x2gb) ram @PC3200
Win7Pro x64
GTX260 (216 core) running 197.45 drivers
Onboard sound from Evga 780i FTW motherboard