Yes, this problem is fixed in 4.2.1 so you can stick to it. I would not recommend 5.0 for you as there are more breaking changes in this version than usually, notably because of the WebGPU support.
@Evgeni_Popov I forgot to mention the app was built with Unity Exporter (Babylon 4.0.0, Unity 2019.2.3f1). Which version most closely matches 4.2.1 (have trouble figuring it out from the github repo of the exporter).
Thanks in advance
That really long ago… i try to support the current codebase… That is Version 5 using GLTF as the file format…
I dont know how far back my legacy versions go… but you try this folder and see if one of these helps… but i cant say for sure if version BabylonJS version 4 is with .babylon file type support is in there… But that is all you got to try from