diff --git a/core/magazine.py b/core/magazine.py
index 57d53a1..7a25bd6 100644
--- a/core/magazine.py
+++ b/core/magazine.py
@@ -126,11 +126,17 @@ class Block:
     # (clean_up_regions). Part of the model so every path that rebuilds blocks keeps it -- and does
     # not crash on it (drawing a region did, "unexpected keyword argument 'original_text'").
     original_text: str = ""
+    # box_manual: the reviewer placed or resized this box, so snap_text_boxes never moves it.
+    # box_snapped: snap_text_boxes fitted it to its text. Both are model fields for the same
+    # reason as original_text: every path that rebuilds blocks with Block(**b) must accept them.
+    box_manual: bool = False
+    box_snapped: bool = False
 
     def to_json(self) -> dict[str, Any]:
         data = asdict(self)
-        if not data["original_text"]:
-            del data["original_text"]
+        for optional in ("original_text", "box_manual", "box_snapped"):
+            if not data[optional]:
+                del data[optional]
         return data
 
 
diff --git a/tests/test_magazine.py b/tests/test_magazine.py
index c4f7952..11a88e0 100644
--- a/tests/test_magazine.py
+++ b/tests/test_magazine.py
@@ -2747,3 +2747,23 @@ class SnapTextBoxesTests(unittest.TestCase):
         self.assertEqual(snap_text_boxes(self.dir, layout)[1], [])
         (self.dir / "pages" / "0001.png").unlink()
         self.assertEqual(snap_text_boxes(self.dir, self.layout([("a", [60, 60, 250, 200], {})]))[1], [])
+
+
+class BoxFlagsSurviveRebuildTests(unittest.TestCase):
+    def test_snapped_and_hand_placed_flags_round_trip_through_block(self):
+        """Regression: a saved box_snapped/box_manual key crashed every Block(**b) rebuild
+        ("unexpected keyword argument 'box_snapped'") and so a page re-OCR."""
+        from core.magazine import Block
+        raw = {"id": "a", "page": 1, "bbox": [0, 0, 1, 1], "type": "body", "text": "t",
+               "box_snapped": True, "box_manual": True}
+        self.assertEqual(Block(**raw).to_json()["box_snapped"], True)
+        plain = Block(id="a", page=1, bbox=[0, 0, 1, 1], type="body", text="t").to_json()
+        self.assertNotIn("box_snapped", plain)
+        self.assertNotIn("box_manual", plain)
+
+    def test_a_snapped_layout_can_be_rebuilt_by_the_semantic_layout_path(self):
+        from core.magazine import Block, snap_text_boxes
+        import tempfile, pathlib
+        layout = {"pages": [{"page": 1, "width": 100, "height": 100}], "images": [],
+                  "blocks": [{"id": "a", "page": 1, "bbox": [0, 0, 10, 10], "type": "body", "text": "t", "box_snapped": True}]}
+        self.assertEqual([Block(**b).id for b in layout["blocks"]], ["a"])