No, not a bug. Date in your screenshot just refers to the date you've last installed a major update on it. The OS build number will change automatically when a new build gets installed.
Windows 10 May 2021 update now available
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Anonymous
The first major update to Windows 10 of the year, called Windows 10 May 2021 update is now available.
How to get the Windows 10 May 2021 Update
How to get the Windows 10 May 2021 Update | Windows Experience Blog
Windows 10 21H1 Release Health.
Windows 10, version 21H1 | Microsoft Docs
IT tools to support Windows 10, version 21H1
IT tools to support Windows 10, version 21H1 - Microsoft Tech Community
KB5000736: Featured update to Windows 10, version 21H1 by using an enablement package
From the Blog:
In the current environment, we know that you continue to rely on your PCs more than ever. As a result, we are initially taking a measured seeker-based approach to the rollout of the May 2021 Update. We are throttling availability up over the coming weeks to ensure a reliable download experience for all, so the update may not be offered to you right away. Additionally, some devices might have a compatibility issue for which a safeguard hold is in place. In these cases, we will not offer the update until we are confident that you will have a good update experience.
Windows for home | Windows 10 | Windows update
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Anonymous
2021-05-19T13:07:20+00:00 -
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Anonymous
2021-05-19T16:27:14+00:00 Hi Sumit and all,
I installed 21H1 yesterday and have "Zero" problems to report. Very Fast and Smooth Update on my Dell Alienware Area-51 Laptop. There are Seven systems in my household and mine was the only one offered the update so far. But I know it is a throttled Update and will arrive soon for the other Six.
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Anonymous
2021-05-19T21:48:28+00:00 Since the last update my computer has been crashing with DRIVERS_IRQL_NOT_LESS_OR_EQUAL. The crash report says that the Windows Protection Platform and the WWA Host stop working. The other apps that stop working look random. I have searched for an answer to this problem and tried many things. I have manually updated drivers, changed the contents of files, installed third party fixers, recovered Windows and did a total fresh reinstall were i reformatted all of the onboard disks. If any body has a better solution to this problem, please let me know.