diff --git a/src/db/db/dbHierNetworkProcessor.cc b/src/db/db/dbHierNetworkProcessor.cc
index 77f33297e..6a87619f4 100644
--- a/src/db/db/dbHierNetworkProcessor.cc
+++ b/src/db/db/dbHierNetworkProcessor.cc
@@ -885,6 +885,16 @@ public:
     add_pair (*i1, p, t, *i2, p, t);
   }
 
+  /**
+   *  @brief Single-instance treatment - may be required because of interactions between array members
+   */
+  void finish (const db::Instance *i, unsigned int /*p1*/)
+  {
+    if (i->size () > 1) {
+      add_single_inst (*i);
+    }
+  }
+
   /**
    *  @brief Receiver main event for local-to-instance interactions
    */
@@ -1076,6 +1086,69 @@ private:
 
   }
 
+  /**
+   *  @brief Single instance treatment
+   */
+  void add_single_inst (const db::Instance &i)
+  {
+    box_type bb = (*mp_cbc) (i.cell_index ());
+    const db::Cell &cell = mp_layout->cell (i.cell_index ());
+
+    for (db::CellInstArray::iterator ii = i.begin (); ! ii.at_end (); ++ii) {
+
+      db::ICplxTrans tt = i.complex_trans (*ii);
+      box_type ib = bb.transformed (tt);
+
+      std::vector<db::InstElement> pp;
+      pp.push_back (db::InstElement (i, ii));
+
+      bool any = false;
+      bool first = true;
+
+      for (db::CellInstArray::iterator ii2 = i.begin_touching (ib, mp_layout); ! ii2.at_end (); ++ii2) {
+
+        db::ICplxTrans tt2 = i.complex_trans (*ii2);
+        if (tt.equal (tt2)) {
+          //  skip the initial instance
+          continue;
+        }
+
+        box_type ib2 = bb.transformed (tt2);
+
+        if (ib.touches (ib2)) {
+
+          std::vector<db::InstElement> pp2;
+          pp2.push_back (db::InstElement (i, ii2));
+
+          box_type common = (ib & ib2);
+          add_single_pair (common, i.cell_index (), pp, tt, i.cell_index (), pp2, tt2);
+
+          //  dive into cell of ii2 - this is a self-interaction of a cell with parts of itself
+          //  as these self-interactions are expected to be the same always (regular array), we can skip this test the next times.
+          if (first) {
+            for (db::Cell::touching_iterator jj2 = cell.begin_touching (common.transformed (tt2.inverted ())); ! jj2.at_end (); ++jj2) {
+              std::vector<db::InstElement> p;
+              db::ICplxTrans t;
+              add_pair (i, p, t, *jj2, pp2, tt2);
+            }
+          }
+
+          any = true;
+
+        }
+
+      }
+
+      first = false;
+
+      //  we don't expect more to happen on the next instance
+      if (! any) {
+        break;
+      }
+
+    }
+  }
+
   /**
    *  @brief Handles a local clusters vs. the clusters of a specific child instance or instance array
    *  @param c1 The local cluster
diff --git a/src/db/unit_tests/dbHierNetworkProcessorTests.cc b/src/db/unit_tests/dbHierNetworkProcessorTests.cc
index b58f0460a..bb05fe3c4 100644
--- a/src/db/unit_tests/dbHierNetworkProcessorTests.cc
+++ b/src/db/unit_tests/dbHierNetworkProcessorTests.cc
@@ -1006,6 +1006,18 @@ TEST(110_HierClusters)
 TEST(111_HierClusters)
 {
   run_hc_test (_this, "hc_test_l11.gds", "hc_test_au11.gds");
-  run_hc_test_with_backannotation (_this, "hc_test_l4.gds", "hc_test_au4b.gds");
+  run_hc_test_with_backannotation (_this, "hc_test_l11.gds", "hc_test_au11b.gds");
+}
+
+TEST(112_HierClusters)
+{
+  run_hc_test (_this, "hc_test_l12.gds", "hc_test_au12.gds");
+  run_hc_test_with_backannotation (_this, "hc_test_l12.gds", "hc_test_au12b.gds");
+}
+
+TEST(113_HierClusters)
+{
+  run_hc_test (_this, "hc_test_l13.gds", "hc_test_au13.gds");
+  run_hc_test_with_backannotation (_this, "hc_test_l13.gds", "hc_test_au13b.gds");
 }
 
diff --git a/testdata/algo/hc_test_au11b.gds b/testdata/algo/hc_test_au11b.gds
new file mode 100644
index 000000000..ee96f0842
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diff --git a/testdata/algo/hc_test_au12.gds b/testdata/algo/hc_test_au12.gds
new file mode 100644
index 000000000..72d2f1097
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diff --git a/testdata/algo/hc_test_au12b.gds b/testdata/algo/hc_test_au12b.gds
new file mode 100644
index 000000000..e70c96177
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diff --git a/testdata/algo/hc_test_au13.gds b/testdata/algo/hc_test_au13.gds
new file mode 100644
index 000000000..d7fe0cc21
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diff --git a/testdata/algo/hc_test_au13b.gds b/testdata/algo/hc_test_au13b.gds
new file mode 100644
index 000000000..f14dfeaa9
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diff --git a/testdata/algo/hc_test_l12.gds b/testdata/algo/hc_test_l12.gds
new file mode 100644
index 000000000..17c1a90df
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diff --git a/testdata/algo/hc_test_l13.gds b/testdata/algo/hc_test_l13.gds
new file mode 100644
index 000000000..b3dccbed4
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