The bug
After half an hour of jungle exploration, I've come to the conclusion that ocelots and parrots don't spawn, they can only be summoned through spawn eggs.
Related issues
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Still in 18w15a

If you clear out the trees, spawning works like expected.

Still in 18w19a.
Couldn't find a single ocelot or a parrot after searching for 30 minutes.
They might just be very very rare though.

Still in 18w21a.
Looked for an hour in the jungle for parrots and ocelots. Nothing found except the normal animals.

Protip: don't waste an hour on this. Use the /kill command and it will tell you how many entities of your chosen type have died, if any.

The parrots are back in 18w22a, but I still can't find any ocelots. Also some of the rabbits are missing as per MC-128071.
seed: -8300275442758179407
xyz: -2326 115 4139

Still missing ocelots in 18w22b.

Please reopen this. I still can't find any ocelots in 18w22c.
seed: -8300275442758179407
xyz: -2326 115 4139

I have found parrots and ocelots in the latest snapshot.
I think it's because of MC-125283