When I trying to spawn the Wandering Trader with its llamas that are leashed to it (with Leash NBT Tag), the trader spawns but the llamas disappear. Video demonstration and world with the function that I'm executed in it, attached.
Environment
macOS 10.10.0
CPU: 2.4 GHz Intel Core i5
RAM: 16 GB 1600 MHz DDR3
GPU: Intel HD Graphics 3000 512 MB
Java: built-in into the Minecraft launcher
Hello!
I wanted you to know that this issue has already been reported. It's being tracked as MC-210224 if you would like to check it out there! Thanks! 🙂