Tested with QDS 4.8.0 Built on Sep 2 2025 15:05:56 based on Qt 6.9.2 (MSVC 2022, x86_64)

Update:

Re-tested with QDS 4.8.0 Built on Sep 8 2025 01:24:29 based on Qt 6.9.2 (MSVC 2022, x86_64)

Bug seems to happen again on Windows and macOS.

qtdesignstudio_TiLxO6whDQ.mp4

Changing the Type and Name of created material causes multiple bugs. New material might not appear, changing the name does not work, changing the type might not work etc.

I'll update this report later with some specific steps.

Steps:
1. Create Empty project
2. Add QtQuick3D module to the project
3. Add View3D under rectangle
4. Go to principleMaterial in Navigator and click it
5. Create new SpecularGlossy material with some name
6. Create new custom material with some name

During step 6 something happens and the custom material is not shown in Material Browser

Here is a video of the steps:

qtdesignstudio_TDgS4MraTm.mp4