Image Slide Show - aspect ratio doesn't work, size is not evaluated into transform

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

31.0.0

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/h7DgEjqQrVs276ig

OBS Studio Crash Log URL

No response

Expected Behavior

• Bounding Size/Aspect Ratio should show Aspect Ratios or Automatic or Resolutions
• Images should maintain their original aspect ratio when displayed in the slideshow when Automatic is selected
• Size properties should be properly evaluated and applied through transform operations

Current Behavior

• Aspect ratio is not being respected (you can enter any value, nothing is changing)
• Options are missing in Bounding Size/Aspect Ratio dropdown. Only current resolution is there.
• Size properties are not being correctly evaluated into transform operations (might be related to not able to select Automatic in the Bounding Size). Edit Transform shows size 0px x 0px for slideshow.

Steps to Reproduce

1. Create Slide Show
2. Append some directory with images
3. Try to change "Bounding Size/Aspect Ratio" to "Automatic" or "16:9"
4. When "Automatic", go to Edit Transform and try to center the Image Slide Show (positional Center, Bounds - Maximum size only, Alignment to Center)

Anything else we should know?

No response

Start with the Image Slide Show source properties and Edit Transform entry points described in the reproduction steps, using the attached OBS log for context. Trace how Bounding Size/Aspect Ratio and image dimensions reach transform operations; done means Automatic and 16:9 are available, original image ratios are preserved, and Edit Transform reports nonzero slideshow dimensions.