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Microsoft Releases Cumulative Update KB5015039 for Insider Build Windows 11 Build 25120, available on the Dev channel. This update does not bring any innovations and is aimed at testing the service system. In particular, the company is testing the possibility of releasing and installing updates on top of previous updates.
After the update, the system build number will change to 25120.1010.rs_prerelease_flt.220513-1700.
Note that the maintenance system is one of the key components of the operating system, which should work as stably as possible, since it is it that is used to distribute functional and cumulative updates.