In Twinmotion 2026.1 Preview, I encountered an issue where exporting a still image from data originally set up in 2025.2 resulted in an extremely dark output, even though the settings remained the same.
This issue primarily occurs in indoor scenes where the only light source is a neon material applied to an object. The final output is significantly darker than what is shown in the Path Tracer preview window.
When I reopen the same file in 2025.2 and export it again, I get the expected results as before. Therefore, I suspect this might be a bug in 2026.1 Preview.