Llamas despawned and the new ones I got cannot reproduce

When 1.14.2 Pre-Release 2 came, all of my llamas had despawned from my farm. They were all llamas I got from taking them from wandering traders. Then I got new ones, which also were trader llamas, tamed them and then tried to breed them. They enter the love mode, and an experience orb is released and I can see the llama baby for a few seconds before it disappears. I haven't yet tried this with llamas that aren't originally trader llamas, so I don't know if this issue is only with them or with all the llamas.