Some time ago Microsoft released the KB5015039 update for Windows 11 Insider Dev Channel users, where this update will bring the OS build to 25120.1010.
And yes, as you can guess, because it has the suffix 1010, it can be concluded that this update is just a pipeline test, in other words, there is nothing that Microsoft has added in this update.
“We are starting to roll out Cumulative Update Build 25120.1010 (KB5015039). This update does not include anything new and is designed to test our servicing pipeline for builds in the Dev Channel.said Microsoft.
To see information from Build 25120, you can read the following article: Microsoft Releases Windows 11 Insider Build 25120 For Insider Dev Channel
If you are a Windows 11 Insider Dev Channel user, you can immediately update your Windows 11 with this update via the page Settings > Windows Updates, but if not, you can freely skip this update.