"Curl error 3: URL rejected" logged when Cloud Diagnostics captures an unhandled exception during Play Mode

How to reproduce:

1. Open the attached "IN-149422" project
2. Locate Edit > Project Settings > Services > Diagnostics
3. Make sure the project has “Diagnostics Data” enabled
4. Locate Edit > Editor > Enter Play Mode Settings > When entering Play Mode
5. Make sure the project has “Reload Scene only” or “Do no reload Domain or Scene” chosen
6. Re-enter Play Mode 10 times
7. Observe the Console

Actual result: “Curl error 3: URL rejected: Malformed input to a URL function“ is logged (the editor attempts to upload the exception report to an empty/malformed URL)
Expected result: Unhandled exception is reported (or the upload is skipped) without logging malformed-URL curl errors

Reproducible with: 6000.6.0a5, 6000.6.0b10, 6000.7.0a5
Not reproducible with: 6000.0.82f1, 6000.3.23f1, 6000.5.10f1, 6000.6.0a4

Reproducible on: Windows 11 (25H2), Windows 10 (by user)
Not reproducible on: No other environments tested

Workaround: Go to Edit > Project Settings > Services and disable Cloud Diagnostics

Notes:

• If “Diagnostics Data” is disabled, connect project to any cloud project in organization and enable “Diagnostics Data”
• The error is not present when Domain Reload is enabled