so after trying couple times with 3 char with 3 pet
my pet missing when :
1. respawn / enter juno city
2. respawn / enter geffen city
3. enter green petite map
will be back when :
1. enter eden warper
2. teleport with kafra (sometimes)
3. teleport with prontera warper in juno
4. victoria qwest warp gh
i only try this with my account and my client. so its either my client gone wrong or its bug after ISP maintenance.