I have experienced this issue.

In a group fighting Qilin, there is often a tank that is supposed to pull and hold the "pets" of Qilin if they spawn. The tank usually does do things like Provoke to get their attention. At the same time, I have had an avatar up doing attacks on Qilin without doing anything at all to the "pets". But when I release the Avatar, the "pets" leave the tank and come after me in spite of the fact I have done nothing to the "pets". And the tank has a hard time getting them back until I am K.O.ed.

I will be very happy to see this fix when I am SMN on fights like this.

It will have no effect at all on solo BST in Dynamis. This issue only makes itself visible in situations where several people are involved and some monsters are held by a tank while other monsters are defeated by the majority of the group including the pet master. (I assume it's the same for SMN, BST, DRG, and PUP.)