Naturally spawned white cats (Khao Manee) cannot be tamed regardless of feeding it with raw fishes (I used raw salmon at the time of testing). However, this bug doesn't affect other variation of naturally spawned cats.
Steps to reproduce:

1. Create a world with experimental gameplay enable.
2. Find a village.
3. Find white cat with different eye color.
4. Feel the cat with raw salmon.
5. Notice that the cat isn't tamed.