Since when the default browser on Dev channel is Edge Beta? 🤷‍♂️
Perhaps it is a requisite for Copilot?
I see the same Version 115.0.1901.157 on my Dev channel.
The standard version is 114.0.1823.67, but according to the blog 115.0.1901.150 or higher is needed. 🤷‍♂️
From the blog:
Windows Copilot Preview
Back in May at the Build conference, we introduced Windows Copilot for Windows 11. In today’s flight we are offering an early look of Windows Copilot to Windows Insiders in the Dev Channel via a controlled feature rollout. This first preview focuses on our integrated UI experience, with additional functionality coming down the road in future previews. To use Copilot in this flight you must have Windows Build 23493 or higher in the Dev Channel, and Microsoft Edge version 115.0.1901.150 or higher.
From a web article:
It’s recommended to have Microsoft Edge 115 installed on your PC.
The 23493 build automatically installs the Beta version of Edge (version 115),
so you don’t have to install it manually.
However, if Copilot doesn’t appear on your system,
make sure to install Edge from the Beta or Dev channel.