Llama AI seems broken. When attaching lead, will not form caravans*. Insteaded they attempt to fight the lead as if untamed.

*Caravans will form if the lead is attached to a post, however the lead llama is still unmanageable.

Note: Survival mode world (144MB) is five years old with countless hours by wife and I, originally created on PS3 version, imported to PS4, then converted once Bedrock Edition was released to PS4. Caravans did function properly after Bedrock conversion, seems an update at some point has broken them. Attachment limitations necessitated YouTube uploads and link embedding.

Youtube: Minecraft Llama Bug (1)

Youtube: Minecraft Llama Bug (2)