When exporting obj files from plasticity there are missing objects

[carolosf]

ArmorPaint version:
ArmorPaint.org - v1.0 alpha (2023-09-25) - b658b62

OS / GPU model:
macOS - Metal M1

Issue description:
When I import obj files exported from plasticity if I try import by object it only imports two objects.
When I import by material or group all the objects are imported but obviously they are all imported as one object which makes it difficult to easily colour things.

My work around is to make a few exports by material in Plasticity and then append import them by group/material.

It works but makes my workflow slower.

By the way - great little tool - keep up the good work!

Steps to reproduce:
Export in Plasticity.

Import in ArmorPaint.