In the recent past, we have seen the Windows 11 taskbar receive a ton of updates with the aim of improving the user experience. The newest is a new overflow menu designed to make it easier for users to launch and switch apps when space is at a premium.
A Reddit user u/caipira113 spotted what appeared to be an undocumented new feature, rounded corners in the taskbar (by Neowin). The rounded taskbar appeared for the user while downloading Windows 11 build 25174.1000 from the dev channel. They had previously hinted at the same case with build 25131 which had multiple Microsoft Store updates, but this time around there is evidence to support this claim as shown below.
However, Brandon LeBlanc, a senior program manager on the Windows Insider program team, through a tweet confirmed that it “looks like” a bug and that they don’t do any A/B testing.
It looks like a bug. There are a few bugs like this that change the UI in different ways. It’s not something we A/B test.
— Brandon LeBlanc (@brandonleblanc) August 5, 2022
The Reddit user further reported that the rounded corners appeared randomly and did not disappear even after trying to update the display driver. It however disappeared after restarting explorer.exe via command prompt. As stated by Brandonit looks like a bug that impairs the normal functioning of the user interface.