Fix digitizing features using CAD dock when layer CRS != canvas CRS

python/gui/auto_generated/qgsadvanceddigitizingdockwidget.sip.in

@@ -309,6 +309,15 @@ automatically populated when user clicks with left mouse button on map canvas.
 The last point.
 Helper for the CAD point list. The CAD point list is the list of points
 currently digitized. It contains both  "normal" points and intermediate points (construction mode).
+
+.. versionadded:: 3.22
+%End
+
+    QgsPoint currentPointLayerCoordinates( QgsMapLayer *layer ) const;
+%Docstring
+Returns the last CAD point, in a map ``layer``'s coordinates.
+
+.. versionadded:: 3.22
 %End
 
  QgsPointXY currentPoint( bool *exists  = 0 ) const /Deprecated/;

src/gui/qgsadvanceddigitizingdockwidget.cpp

@@ -1537,6 +1537,19 @@ QgsPoint QgsAdvancedDigitizingDockWidget::currentPointV2( bool *exist ) const
     return QgsPoint();
 }
 
+QgsPoint QgsAdvancedDigitizingDockWidget::currentPointLayerCoordinates( QgsMapLayer *layer ) const
+{
+  if ( pointsCount() > 0 && layer )
+  {
+    QgsPoint res = mCadPointList.value( 0 );
+    const QgsPointXY layerCoordinates = mMapCanvas->mapSettings().mapToLayerCoordinates( layer, res );
+    res.setX( layerCoordinates.x() );
+    res.setY( layerCoordinates.y() );
+    return res;
+  }
+  return QgsPoint();
+}
+
 QgsPoint QgsAdvancedDigitizingDockWidget::previousPointV2( bool *exist ) const
 {
   if ( exist )

src/gui/qgsadvanceddigitizingdockwidget.h

@@ -324,9 +324,18 @@ class GUI_EXPORT QgsAdvancedDigitizingDockWidget : public QgsDockWidget, private
      * The last point.
      * Helper for the CAD point list. The CAD point list is the list of points
      * currently digitized. It contains both  "normal" points and intermediate points (construction mode).
+     *
+     * \since QGIS 3.22
      */
     QgsPoint currentPointV2( bool *exists  = nullptr ) const;
 
+    /**
+     * Returns the last CAD point, in a map \a layer's coordinates.
+     *
+     * \since QGIS 3.22
+     */
+    QgsPoint currentPointLayerCoordinates( QgsMapLayer *layer ) const;
+
     /**
      * The last point.
      * Helper for the CAD point list. The CAD point list is the list of points

src/gui/qgsmaptoolcapture.cpp

@@ -488,7 +488,7 @@ int QgsMapToolCapture::fetchLayerPoint( const QgsPointLocator::Match &match, Qgs
   QgsVectorLayer *sourceLayer = match.layer();
   if ( mCadDockWidget && mCadDockWidget->cadEnabled() )
   {
-    layerPoint = mCadDockWidget->currentPointV2();
+    layerPoint = mCadDockWidget->currentPointLayerCoordinates( vlayer );
     return 0;
   }
   else