In the Windows HLK 24H2 (updated May 2025), the test "Installable File System Filter Test" is failing on Windows Server 2025 24H2. The following is present in the .wtl file regarding the failure:
Error 6/24/2025 10:21:34.726 PM E40.1A1C : +TEST+SEV2 : Test :FlushBuffersRootTest
Group :SectionsCaching
Status :C000004E (IFSTEST_TEST_STATISTICS_ERROR)
Description :{Msg# seccache!flushrot!18} The first write statistic
was 1310720. The second 1310720. The total number of
bytes modified on the files is 291088. It does not
appear that all data was flushed.
WDKTUID: A72C4D26-977B-19CB-2E11-D6F93917D718
I've noted that with down-level HLK controllers & test systems, the same test completes on Windows Server 2022 & 2019 with the same underlying failure, yet there is a filter present which allows the failure to be suppressed and the status glyph has a circle around the checkmark.
I've ensured that the latest available filter update, downloaded 2025-06-25, has been applied to my controller, but the failure is not being filtered and converted to a successful result.