Aspect Ratio Nano Banana end result Firefly Boards

Hey! 

Quick question: Previously, it was always clear what aspect ratio Gemini 2.5 Nano Banana had as output:

When you selected two or more reference images, the last reference image defined the output aspect ratio (following the way Nano Banana works when reference images are uploaded to the model).

Since a few days, this behavior changed, and it now sometimes outputs the aspect ratio of the first reference image, and sometimes of the last one. Even with exactly the same prompts, and the same reference images. This feels really unpredictable. 

Does someone know how to solve this?