Sweet berry bushes do not generate in the Old Growth Pine Taiga and Old Growth Spruce Taiga biomes

Summary:
Sweet berry bushes do not generate in the Old Growth Pine Taiga and Old Growth Spruce Taiga biomes (previously known as Giant Tree Taiga and Giant Spruce Taiga).

This bug also existed in Java Edition and was fixed in 1.15 Pre-Release 2: MC-166590.

Steps to Reproduce:

1. Create a new Creative world with the seed 22061

2. Teleport to the following coordinates:

   3343 ~ -1469
   1332 ~ 2728
   1183 ~ -2542

3. Look for sweet berry bushes

Observed Results:
Sweet berry bushes cannot be found.

Expected Results:
Sweet berry bushes should generate in the Old Growth Pine Taiga and Old Growth Spruce Taiga biomes.