FBX import - White placeholder material when keeping scene materials

Hello guys,
I’ve been using Twinmotion for 5 years and I’d say I’ve become quite good at it.
One of my usual workflows is modelling in 3ds max, placing materials (now OpenPBR Material), export and FBX and import it into Twinmotion. I do 4D construction visuals, so the same project may have 10 different phases.
One of the reason why I chose Twinmotion over Lumion was the fact that I could import the FBX and use the scene materials, saving so much time!
With the new Twinmotion 2026, all is gone south! Let me show you an example:

  1. I import the context/working area FBX and put the materials:

  1. I then try to import the next phase for the context/working area FBX (which has got the same identical materials as the previous one), hoping to keep the same materials I’ve already placed:

  1. this is the result: a placeholder material is created! I can’t edit the material, and I really wanted to change it from Twinmotion, I’d need to use the modelling tool, having to select tens of triangled surface for each side.

  1. If I import and say to keep both materials, it does (at least it doesn’t give the same placeholder material to all of the geometry) but I need to replace all of the materials, which is not ideal!

On the good side, if I refresh an existing FBX, it retains the materials with the same geometry (something it didn’t not happen before) but as soon as you add new geometry, it goes back to placeholder material.

Is there any chance somebody has a solution for this? I’m in the middle of a submission and this issue is doubling my usual working load because I need to deal with hundreds of material replacement.
Thanks for your time and help.
Cheers,

Pierluigi