Hi, anonymous user
Thank you for posting in Microsoft Q&A forum.
SMS_R_System also has the build info, and the info is from heartbeat discovery, but the build info in SMS_G_System_OPERATING_SYSTEM is from hardware inventory, I think you have not enable the hardware inventory because no info in your Resource Explorer, so you may use the query like this:
Select * from SMS_R_System where SMS_R_System.Build="10.0.19044"
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