Random flower patches generate incorrectly

Random flower patches in plains and savanna biomes have diffrent flower types instead of one flower type in each patch (like in version 1.17.1).

 

How to reproduce:

1. Create a new world in version 21w44a (default world type)

2. Locate a plains or savanna biome

3. Find a flower patch

Observed result:

A single flower patch has multiple flower types

Expected result:

A single flower patch has one type of flower, like in version 1.17.1