Scale filtering breaks when source is rotated (any but 180deg)

Operating System Info

Windows 11

Other OS

No response

OBS Studio Version

31.1.2

OBS Studio Version (Other)

No response

OBS Studio Log URL

https://obsproject.com/logs/DOH4ZpC9Aou3n6r1

OBS Studio Crash Log URL

No response

Expected Behavior

Scale filters should function when a source is rotated 90 degrees via transform option.

Current Behavior

Scale filtering breaks when a resized source is transformed with rotations such as 90deg CW/CCW or custom degrees that aren't 180 deg.

Source without transform or scale filtering

Source without transform, scale filtering applied (working as intended)

Source rotated 90deg, scale filtering applied (broken)

Source rotated custom degrees, scale filtering applied (broken)

Steps to Reproduce

1. Add an image or any other source
2. Shrink source to be less than original so artifacting appears
3. Apply Scale Filtering to source, note it applies correctly.
4. Transform source by rotating 90 deg CW, note Scale Filtering is now broken.
5. Transform source to custom rotation via transform dialogue - note filtering still broken.
6. Transform source to 180 or -180deg, note filtering magically works again.

Anything else we should know?

No response

Reproduce this in OBS Studio 31.1.2 on Windows 11 using the listed image-source steps, comparing unrotated, 90-degree, custom-angle, and 180-degree transforms with scale filtering. Trace the graphics path responsible for source transforms and scaling. Done means filtering remains correct for 90-degree, custom, and 180-degree rotations.