URIs to log in on VS Code don't work on Vivaldi

Question

I'm on Manjaro KDE, using Vivaldi browser, and VS Code from Snap.

To log in to things like Sync Settings on VS Code, it opens your browser to a page where you can log in to GitHub, and it then tries to open a magnetic URI with VS Code, containing the generated tokens.

Since I moved to Manjaro, this never worked for me, but before, prior to trying to open the magnetic URI, the web page showed you the URI and allowed you to copy-paste it manually back into VS Code, and that's what I used to do, and it worked fine.

Now, that option seems to be gone, and it logged me out of basically everything on VS Code.

What happens is the following:

1. Go to "Sign in to Sync Settings"
   
2. "Sign in with GitHub"
   
3. Page opens on browser, prompting to "Open xdg-open"
   
4. Another instance of VS Code appears, "Visual Studio Code - URL Handler"
   
5. This remains loading for a while
   
6. And then it says "Cancelled"
   

The same happens whenever I try to log in on the other options, Copilot and Live Share.

System info:

Operating System: Manjaro Linux
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.3
Kernel Version: 5.15.28-1-MANJARO (64-bit)
Graphics Platform: X11
Processors: 4 × AMD Ryzen 3 2200G with Radeon Vega Graphics
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970/PCIe/SSE2

VS Code info:

Version: 1.66.1
Commit: 8dfae7a5cd50421d10cd99cb873990460525a898
Date: 2022-04-06T14:51:26.173Z
Electron: 17.2.0
Chromium: 98.0.4758.109
Node.js: 16.13.0
V8: 9.8.177.11-electron.0
OS: Linux x64 5.15.28-1-MANJARO snap

Edit: It seems that using Chromium as a default browser worked, so this issue is likely related to Vivaldi somehow.