“Bonjour” Jean-Philippe, and thanks for reporting the bugs
I managed to reproduce the bug on my side considering the distortion problem you encountered. Removing hierarchies is definitely not a viable option in the long-run, so we’ll try to come with a solution to this.
Concerning the BSDF shader issue, could I ask you - if you manage to get your hands onto one - to upload a version of a problematic .blend file ?
The most stable approach for now would be to use the “Principled BSDF” shader in the node graphs, and use its “Emission” and “Alpha” input sockets to plug in the different maps (don’t forget to activate a Blend Mode in the material options if doing so!), without relying on Emission or Transparent shader nodes:
I’m not sure if this workflow could fit your students’ usage though…
Thanks once again for your help, any feedback is appreciated !