Lumen lighting in Presentations may appear darker than in Viewport

Reported in SF [Link Removed]

In some scenes with Lumen enabled, interior scene lighting without direct lighting can appear drastically darker in Cloud Presentations than they do in the editor viewport. This only appears to affect Lumen and the lighting in Standard GI is consistent.

Tested in a scene in TM 2025.2 and the same scene in 2026.1

Does not appear to occur for all scenes, but occurs consistently in the client scene.

Download client file from [Link Removed]

1. Open the Twinmotion scene
2. Export the Presentation to the Cloud (Presentation from my testing can be accessed here[Link Removed] )
3. Open the exported Presentation
4. Compare the lighting in the interior scenes of the Presentation in the editor viewport and the Cloud viewport, starting with Kitchen.

Result: The interior scenes are drastically darker in the Cloud than the editor preview