When breeding a trader llama with a regular llama, the trader llama does not make a kissing pose

Steps to reproduce

1. Summon a tamed llama and a tamed trader llama

   /summon llama ~ ~ ~ {Tame:1}

   /summon trader_llama ~ ~ ~ {Tame:1}

2. Feed a hay bale to each llama
   → The regular llama makes a kissing pose
   → The trader llama does not make a kissing pose