[German]Microsoft is currently testing the update KB4571744 with Windows Insiders. The description of the update also says that a defrag error is fixed. However, the hope that the bug that defragmented SSDs was fixed has been dashed. Also with the update, SSDs are further (erroneously) defragmented instead of optimized. I have added the details in the blog post Windows 10 Version 2004: Update KB4571744 will fix the Defrag bug.
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the KB4571744 update has been officially released TH Sept. 3 as build 19041.488, guenni:
https://support.microsoft.com/en-us/help/4571744/windows-10-update-kb4571744
also reported recently by BleepingComputer:
https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-kb4571744-to-fix-windows-10-update-issue/
when I was beta testing KB4571744 as build 19041.487, that update only patched the defragproxy.dll, defragres.dll & defragsvc.dll files – KB4571744 did not update the defrag.exe & dfrgui.exe files which were still at build 19041.84