ENHANCED_KEY flag missing when releasing RightAlt

Windows Terminal version

current main

Windows build number

10.0.19045.4894

Other Software

No response

Steps to reproduce

1. Run the following c++ code:

#include <iostream>
#include <windows.h>
int main()
{
    INPUT_RECORD rec;
    DWORD count;
    while (true)
    {
        ::ReadConsoleInputW(::GetStdHandle(STD_INPUT_HANDLE), &rec, 1, &count);
        if (rec.EventType == KEY_EVENT)
        {
            std::cout << "type: KEY_EVENT" << std::hex
                      << ", down: " << rec.Event.KeyEvent.bKeyDown
                      << ", ENHANCED_KEY: " << !!(rec.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY)
                      << ", ctrl: 0x" << rec.Event.KeyEvent.dwControlKeyState
                      << ", vcod: 0x" << rec.Event.KeyEvent.wVirtualKeyCode
                      << ", scod: 0x" << rec.Event.KeyEvent.wVirtualScanCode
                      << ", wchr: 0x" << rec.Event.KeyEvent.uChar.UnicodeChar << '\n';
        }
    }
}

2. Press LeftCtrl key, press RightCtrl key, check ENHANCED_KEY flag.
3. Press LeftAlt key, press RightAlt key, check ENHANCED_KEY flag.

Expected Behavior

The ENHANCED_KEY flag is present when RightAlt is pressed and released.

The current conhost.exe is not affected by this issue.

Actual Behavior

The ENHANCED_KEY flag is absent when RightAlt is released, but is present when RightAlt is pressed.