Reproduction steps:
1. Ensure Windows is set to a light theme (Windows Settings → Personalization → Themes)
2. Open the Unity Bug Reporter via the Unity Editor (Help → Report a bug…) or (…/BugReporter/UnityBugReporter.exe) in the Editor’s installation folder
3. Observe the result

Expected result: Textboxes have clear outlines, all text has a clear contrast from the background
Actual result: Textboxes are harder to distinguish from the background, and the text in certain fields (e.g. email, names of attachments, other details) has a lower contrast level, making the text difficult to read

Reproducible with: 6000.1.0f1, 6000.2.0a9
Could not test with: 2021.3.51f1, 2022.3.61f1, 6000.0.47f1 (These versions use the old bug reporter interface)

Reproducible on: Windows 11
Not reproducible on: No other environments tested