[Bug 52149] New: user32:dialog fails in test_DialogBoxParam() on current Windows 10 21H1

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52149

Bug ID: 52149
           Summary: user32:dialog fails in test_DialogBoxParam() on
                    current Windows 10 21H1
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]

user32:dialog fails in test_DialogBoxParam() on current Windows 10 21H1:

dialog.c:1854: Test failed: got 1407

https://test.winehq.org/data/patterns.html#user32:dialog

So instead of failing with an error code of 0, the call below fails with
ERROR_CANNOT_FIND_WND_CLASS... which makes sense?

ret = DialogBoxParamA(GetModuleHandleA(NULL), "TEST_DIALOG_INVALID_CLASS",
0, DestroyDlgWinProc, 0);

It's interesting to note that this failure did not happen on the initial
Windows 10 21H1 test configurations (2021-08-23). As far as I can tell it's
only after KB5006670 was applied (on 2021-10-21) that the test started failing.
Unfortunately this is a cumulative update so it may not help narrow down the
cause very much.