with chm document，do not show mainpage menu at left size menu【V1.9.5】

[git45016683]

Describe the bug At V1.9.5 version， my mainpage do not show at left size menu when i generate chm document。 But it works ok at html document。 by the way，it both works ok（chm/html）at V1.9.4.

Code example mainpage.h:

/** @mainpage 

    @htmlonly

    <TABLE width="97%" border="0" CELLSPACING="0" style="margin:auto;">
        <TR>
            <TD align="top" with="100%" height="100%">
                <div style="display: flex; align-items: center; justify-content: center;">
                    <br>
                    </br>
                    <div align="center"><img src="homepage.JPG"></div>
                </div>
            </TD>
        </tr>
    </TABLE>

    @endhtmlonly

*/

Expected result left size menu:

+xxxProject Name
  +xxxProject Name
  +group name
  +group name1

Actual result

+xxxProject Name
  +group name
  +group name1

the submenu +xxxProject Name do not show at chm document file。but it can show at html file。

Screencaps If applicable, add screencaps to help explain your problem.

Your System:

• OS: [Windows]
• VS Code Version [1.71.0]
• Doxdocgen Code Version [1.9.5]

Additional context Add any other context about the problem here.