Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

A specific URL where the issue occurs.

https://piquark6046.github.io/testpage/FetchResponse/

Steps to Reproduce

The step to reproduce is attached in the video.

piquark6046.github.io##+js(no-fetch-if, adsbygoogle.js)
||pagead2.googlesyndication.com/pagead/js/adsbygoogle.js$redirect=googlesyndication_adsbygoogle.js
@@||pagead2.googlesyndication.com/pagead/js/adsbygoogle.js

Expected behavior

Instance properties of Response return consistently like an unblocked request.

Actual behavior

Instance properties of Response return various values.

uBO version

1.47.2 (Firefox); 1.47.4 (Brave)

Browser name and version

Mozilla Firefox Developer Edition 111.0b8; Brave 1.48.171

Operating System and version

Ubuntu 22.10