How to preserve sub objects unity ?

Hey,

I'm using metadata in my .obj file with "o object name" to separate different objets in the mesh. The thing is that when I use draco for compression and decompression, I can still have my sub objects but they are totally splitted as this :

o object1
. . .
. . .
o object2
. . .
o object1
. . .

I understand that not using the sequential encoding, I'm not preserving the faces order but as my sub objects are separated, I don't understand why draco won't compress every faces of my first sub object which should be linked together before moving on the second object.

Is there a way to keep every faces of a sub object together ?

Thanks.