Bred exhibit animal's star rating stay at 0

I noticed that my captive bred exhibit animals never have more than 0 star rating no matter how much time passed, while those I bought from market will have their star rating increase over time (I noted their star rating when bought). They are all have 100% welfare too.

I tried many times with different species, in challenge mod and creative mode (with enable welfare on) and the results are the same.

Not sure if it's intentional, but I think it's strange.
 
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