Hives don't spawn in skyblock maps...
There is any way to force spawn?
Please make hives craftable or add a special hive wich change when placed in a biome.

Like many other mods, forestry does not support skyblock by itself. ExNihilo added the Scented Artificial Hive in older mc versions. But the current port of ExNihilo for 1.12 has nothing like this.
BloodyMods/ExNihiloCreatio#114