diff --git a/src/slic3r/GUI/PartPlate.cpp b/src/slic3r/GUI/PartPlate.cpp
index ffd01e48d9..f81038298b 100644
--- a/src/slic3r/GUI/PartPlate.cpp
+++ b/src/slic3r/GUI/PartPlate.cpp
@@ -2070,6 +2070,16 @@ bool PartPlate::check_outside(int obj_id, int instance_id, BoundingBoxf3* boundi
 	if (instance_box.max.z() > plate_box.min.z())
 		plate_box.min.z() += instance_box.min.z(); // not considering outsize if sinking
 
+	if (instance_box.min.z() < SINKING_Z_THRESHOLD) {
+		// Orca: For sinking object, we use a more expensive algorithm so part below build plate won't be considered
+		if (plate_box.intersects(instance_box)) {
+			// TODO: FIXME: this does not take exclusion area into account
+			const BuildVolume build_volume(get_shape(), m_plater->build_volume().printable_height());
+			const auto state = instance->calc_print_volume_state(build_volume);
+			outside = state == ModelInstancePVS_Partly_Outside;
+		}
+	}
+	else
 	if (plate_box.contains(instance_box))
 	{
 		if (m_exclude_bounding_box.size() > 0)