Screen Viewport becomes a square instead of rotating when Portrait and Portrait Upside Down are set to false in the Player on Foldable Mobile Devices

How to reproduce:
1. Open the attached “IN-153964.zip” Project
2. Build the Project on Android
3. Turn on Auto-Rotate on the mobile device
4. Run the built Project
5. Turn off the “Portrait” and the “Portrait UpsideDown” Settings in the Player
6. Observe the Resolution sizes in the Player
7. Physically rotate the Phone
8. Observe the Resolution sizes in the Player

Actual result: Landscape Y resolution loses pixels and a visible dead zone appears
Expected result: Resolution size correctly rotates and scales depending on the rotated position

Reproducible with: 6000.3.22f1 (user’s)

Testing environment: macOS 26.6.2 (M3 Pro)

Reproducible on:
Google Pixel11 Pro Fold 256GB / Android17 (user’s)

Not reproducible on:
VLNQA00411 - Galaxy Z Fold3 5G (SM-F926B) - CPU: Snapdragon 888, GPU: Adreno 660, OS: 11
VLNQA00593 - Google Pixel Fold (Pixel Fold) - CPU: Google Tensor G2 (GS201), GPU: Mali-G710, OS: 16
VLNQA00598 - samsung Galaxy Fold (SM-F900F) - CPU: Snapdragon 855 SM8150, GPU: Adreno 640, OS: 9
VLNQA00667 - Google Pixel 10 Pro Fold (Pixel 10 Pro Fold) - CPU: Tensor G5, GPU: PowerVR D-Series DXT-48-1536, OS: 16

Notes:

• CQA Could not reproduce the issue, the bug might be Device and or OS specific
• Possibly related to https://issuetracker.unity.com/issues/17897