Element hiding rules can be removed by a website Brave/Opera

[AdamWr]

Issue Details

• AdGuard version:
  • AdGuard Version 4.1.1
• Browser and version:
  • Brave Version 1.42.95 Chromium: 104.0.5112.81
  • Opera 89.0.4447.91

Steps to reproduce

1. Add this rule:

example.org##body

3. Go to - https://example.org/
4. Run this script in console:

document.querySelectorAll('head style').forEach(e=>e.remove())

Expected Behavior

Website should be blank.

Actual Behavior

AdGuard injects style to head and it's removed by script, so element hiding rule stop working. It seems that this issue occurs only in Brave/Opera.

Screenshots

Screenshots: