To reproduce, run the following test code:


import QtQuick
import QtQuick.Controls as QQC2
import org.kde.kirigami as Kirigami

Item {
    width: 500
    height: 400

    QQC2.Button {
        anchors.centerIn: parent
        text: "open the dialog"
        icon.name: "dialog-messages"
        onClicked: dialog.open()
    }

    Kirigami.Dialog {
        id: dialog

        title: "Hi"

        customFooterActions: [
            Kirigami.Action {
                text: "Do something"
                icon.name: "edit-bomb"
            },
            Kirigami.Action {
                text: "Cry in the corner"
                icon.name: "face-crying"
            }
        ]
    }
}