Bug - Bridge 15 beta - dropdown menu clicks are passed through to the Content panel

Observed with 15.0.0.393 and previous public beta build.

When selecting a menu item from an Extendscript dropdown list, the mouse click is sometimes passed through to the content panel below. I have tested in List and Detail View, reproduced on both Mac Sequoia and Windows 10 Pro.

Step 1: Load a large folder with several thousand items. Select All.

Step 2: run the following script snippet from VSCode to create a test script window:

try{
    testWin = new Window('palette', 'DDL Test', undefined);
    testWin.ddl = testWin.add('dropdownlist', undefined, '');
    for(var i = 0; i < 25; i++){
        testWin.ddl.add('item', 'testitem ' + i.toString());
        }
    testWin.layout.layout(true);
    testWin.show();
    }
catch(e){
    Window.alert(e + e.line);
    }

Step 3: With the test script window over the Content panel, select a dropdownlist item. Only click once!

Result: Dropdownlist item is selected AND mouse click is passed through to Content panel.