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Report the bug in the adobe forum > https://feedback.photoshop.com/

A short test showed that it is possible to combine styles using a script (must saved as *.jsx)...

If you need this feature often, then you can try to ask at the Adobe scripting forum for a script - otherwise just wait and see if Adobe corrects the error.

[URL unfurl="true"]https://community.adobe.com/t5/photoshop/bd-p/photoshop?page=1&sort=latest_replies&filter=all&topics=label-actionsandscripting[/URL]

[CODE=javascript]#target photoshop

var idASty = charIDToTypeID( "ASty" );

    var desc39 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var ref2 = new ActionReference();

        var idStyl = charIDToTypeID( "Styl" );

        ref2.putName( idStyl, "Double Green Slime" ); // change style name

    desc39.putReference( idnull, ref2 );

    var idT = charIDToTypeID( "T   " );

        var ref3 = new ActionReference();

        var idLyr = charIDToTypeID( "Lyr " );

        var idOrdn = charIDToTypeID( "Ordn" );

        var idTrgt = charIDToTypeID( "Trgt" );

        ref3.putEnumerated( idLyr, idOrdn, idTrgt );

    desc39.putReference( idT, ref3 );

    var idGrup = charIDToTypeID( "Grup" );

    desc39.putBoolean( idGrup, true );

executeAction( idASty, desc39, DialogModes.NO );

// =======================================================

var idASty = charIDToTypeID( "ASty" );

    var desc35 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var ref5 = new ActionReference();

        var idStyl = charIDToTypeID( "Styl" );

        ref5.putName( idStyl, "Stamped Aluminium" ); // change style name

    desc35.putReference( idnull, ref5 );

    var idT = charIDToTypeID( "T   " );

        var ref6 = new ActionReference();

        var idLyr = charIDToTypeID( "Lyr " );

        var idOrdn = charIDToTypeID( "Ordn" );

        var idTrgt = charIDToTypeID( "Trgt" );

        ref6.putEnumerated( idLyr, idOrdn, idTrgt );

    desc35.putReference( idT, ref6 );

    var idMrge = charIDToTypeID( "Mrge" );

    desc35.putBoolean( idMrge, true );

    var idGrup = charIDToTypeID( "Grup" );

    desc35.putBoolean( idGrup, true );

executeAction( idASty, desc35, DialogModes.NO );[/CODE]