ProtonVPN Extension Does Not Work With uBlock Origin Enabled. Leaks DNS Requests

[TheNightRider12]

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

ProtonVPN today released their VPN Extension. I installed it. Went to ipleak[.].et and tested things. My IP address was the one of my ISP so I restarted my browser and tried it again. That issue was fixed. My IP address was now one of the VPN's. I then noticed another problem. My DNS Addresses were the one of my ISP and not one of the VPN's. I played around. I made a new browser profile and JUST installed ProtonVPN. Everything worked fine. So then I installed uBO, and did not change anything other than to update the filter lists, then that is when I noticed that my DNS addressed on ipleak[.]net were the ones of my ISP. I disabled uBO, then went and tried IPLeak again. When I did that, my DNS addresses were the ones to the VPN.

A specific URL where the issue occurs.

https://ipleak.net/

Steps to Reproduce

1. Install the ProtonVPN extension
2. Install uBO.
3. Restart your browser (that is due to ProtonVPN Extension not uBO)
4. Go to ipleak[.]net
5. Observe the DNS addresses.

Expected behavior

With uBO installed, my DNS Addresses shown on ipleak[.]net should be ones of my VPN provider. Not my ISPs

Actual behavior

When I went to ipleak[.]net with uBO Installed, the DNS Addresses that got detected were the ones of my ISP, not my VPN.

uBO version

1.47.2

Browser name and version

Firefox Nightly. 112.0a1

Operating System and version

Windows 11. 22H2

[iam-py-test]

Maybe a duplicate of #1743.

[TheNightRider12]

Yes. This comment fixed the issue for me:
#1743 (comment)
Disabling "Uncloak canonical names"
Thank you.

[gwarser]

Duplicate of #1743