There is an inconsistency when trader llamas get in a llama caravan. What I mean by this is when you tie a lead to a normal llama, other normal llamas will follow as per usual, however, trader llamas wont get in the caravan with the others (and yes, there are less than ten llamas when I tested). And if I tie a lead to a trader llama, other trader llamas as well as normal llamas will form a caravan.

How to Recreate

1) Spawn in at least two normal llama and at least two trader llama (Just make sure you have: x=normal llamas, y=trader llamas, x>1, y>1, and have x + y is less than or equal to 10)

2) Tie a lead to a normal llama, and see for yourself that the trader llamas doesn't follow, but the normal llama(s) follows as expected.

3) Then untie the lead from the normal llama and tie it to a trader llama, and see that both the normal llamas and the other trader llama(s) follow.