Unreal Engine 5.6.1 - OpenColorIO / ACES configuration not saving (possible bug)

Hello, I’m having a recurring issue with Unreal Engine 5.6 related to OpenColorIO / ACES configuration.

The config file used by the engine:
C:\Program Files\Epic Games\UE_5.6\Engine\Plugins\Compositing\OpenColorIO\Content\Config\ACES_1.3\config.ocio
does not seem to load correctly, and the project doesn’t keep the custom configuration after restarting the editor.

I’ve tested this on two different computers:

  • PC 1: AMD Ryzen 7 9800X3D, RTX 5070 Ti, UE 5.6.1
  • PC 2: Intel i3-1005G1, UE 5.6.0

The issue is identical on both. Unreal shows the correct path, but when reopening the project, it resets to default.

I’ve attached screenshots and the log file (MyProject2.log) that show the problem.

Could this be a known issue with OpenColorIO or ACES configuration in 5.6.1?
Thanks for your help.