Spruce generation is broken

The bug

Spruce trees are broken. Not only that they are broken when grown by saplings (MC-177412), they can even generate naturally in broken state.

How to reproduce

1. Start a new buffet world using following biomes: Mountains, Taiga, Giant Tree Taiga, Snowy Tundra or Snowy Taiga
2. Wander around
   →  Spruce trees can generate very small or too big.

 

Too small - it is just 3 or 4 logs with less than 10 leaves on it

Too big - large spruce tree with even 4 tiers.