When importing a specific Qt Quick Controls style, things like standalone attached types aren't available

import QtQuick
import QtQuick.Window
import QtQuick.Controls.Basic
import QtQuick.Layouts

Window {
    id: window
    width: 1280
    height: 720
    visible: true

    SplitView {
        anchors.fill: parent
        handle: Rectangle {
            implicitWidth: 10
            color: "tomato"
            opacity: SplitHandle.hovered || SplitHandle.pressed ? 1.0 : 0.0

            Behavior on opacity {
                OpacityAnimator {
                    duration: 900
                    easing.type: Easing.Linear
                }
            }
        }

        Rectangle {
            implicitWidth: 32
            implicitHeight: 32
            color: "steelblue"
        }
        Rectangle {
            implicitWidth: 32
            implicitHeight: 32
            color: "navajowhite"
        }
    }
}

diff --git a/src/quickcontrols/basic/CMakeLists.txt b/src/quickcontrols/basic/CMakeLists.txt
index e45b6d09c0..c6fdf532d3 100644
--- a/src/quickcontrols/basic/CMakeLists.txt
+++ b/src/quickcontrols/basic/CMakeLists.txt
@@ -155,6 +155,8 @@ qt_internal_add_qml_module(qtquickcontrols2basicstyleplugin
     CLASS_NAME QtQuickControls2BasicStylePlugin
     DEPENDENCIES
         QtQuick/auto
+    IMPORTS
+        QtQuick.Templates/auto
     PLUGIN_TARGET qtquickcontrols2basicstyleplugin
     NO_PLUGIN_OPTIONAL
     NO_GENERATE_PLUGIN_SOURCE