For some reason, rabbits can only be found in deserts now. Its been like that for some time, only I just started to care because I found out that strong leaping potions are quite usefull.https://bugs.mojang.com/browse/MC-93680?filter=-2#
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WAI. Rabblits were changed to be smaller and faster, run away from players and spawn only in a very limited number oif biomes. Their skins are now also biome-specific. This change was made in the 1.9 snapshots (15w4xx is think)
According to the wiki, rabbits are also supposed to spawn in taiga and flower forests, but they don't. That's the bug.
I can confirm this.
Though they can also be found in SNOW related biomes,
you are right they don't spawn elsewhere.