diff --git a/src/plone/restapi/serializer/blocks.py b/src/plone/restapi/serializer/blocks.py
index 3d2f564a8f..da1c4a2e62 100644
--- a/src/plone/restapi/serializer/blocks.py
+++ b/src/plone/restapi/serializer/blocks.py
@@ -220,25 +220,22 @@ def _process_data(self, data, field=None):
                 data["overwrite"] = True
                 return data
 
-            if data.get("overwrite"):
-                # Editor decided to overwrite a data
-                return data
-
             if isinstance(value, str):
                 url = value
+                value = [{"@id": url}]
             else:
                 url = value[0].get("@id", "")
             brain = url_to_brain(url)
-
             if brain is not None:
                 serialized_brain = getMultiAdapter(
                     (brain, self.request), ISerializeToJsonSummary
                 )()
 
-                # Fields from the teaser-schema need to be overwritten
-                for key in ["title", "description", "head_title"]:
-                    if key in serialized_brain:
-                        data[key] = serialized_brain[key]
+                if not data.get("overwrite"):
+                    # Update fields at the top level of the block data
+                    for key in ["title", "description", "head_title"]:
+                        if key in serialized_brain:
+                            data[key] = serialized_brain[key]
 
                 # We return the serialized brain.
                 value[0].update(serialized_brain)
diff --git a/src/plone/restapi/tests/test_blocks_serializer.py b/src/plone/restapi/tests/test_blocks_serializer.py
index 9005e2a406..a1c378ad84 100644
--- a/src/plone/restapi/tests/test_blocks_serializer.py
+++ b/src/plone/restapi/tests/test_blocks_serializer.py
@@ -517,3 +517,97 @@ def test_image_scales_serializer_is_json_compatible(self):
             blocks={"123": {"@type": "image", "url": f"../resolveuid/{image_uid}"}},
         )
         self.assertIs(type(res["123"]["image_scales"]), dict)
+
+    def test_teaser_block_serializer_dynamic(self):
+        doc = self.portal["doc1"]
+        doc_uid = doc.UID()
+        resolve_uid_link = f"../resolveuid/{doc_uid}"
+        value = self.serialize(
+            context=self.portal.doc1,
+            blocks={
+                "1": {
+                    "@type": "teaser",
+                    "href": resolve_uid_link,
+                    "overwrite": False,
+                }
+            },
+        )
+
+        block = value["1"]
+        self.assertEqual(block["title"], doc.title)
+        self.assertEqual(block["description"], doc.description)
+        href = block["href"][0]
+        self.assertEqual(href["@id"], doc.absolute_url())
+
+    def test_teaser_block_serializer_dynamic_nested(self):
+        doc = self.portal["doc1"]
+        doc_uid = doc.UID()
+        resolve_uid_link = f"../resolveuid/{doc_uid}"
+        value = self.serialize(
+            context=self.portal.doc1,
+            blocks={
+                "grid": {
+                    "@type": "gridBlock",
+                    "blocks": {
+                        "1": {
+                            "@type": "teaser",
+                            "href": resolve_uid_link,
+                            "overwrite": False,
+                        },
+                    },
+                    "blocks_layout": {"items": ["1"]},
+                }
+            },
+        )
+
+        block = value["grid"]["blocks"]["1"]
+        self.assertEqual(block["title"], doc.title)
+        self.assertEqual(block["description"], doc.description)
+        href = block["href"][0]
+        self.assertEqual(href["@id"], doc.absolute_url())
+
+    def test_teaser_block_serializer_with_overwrite(self):
+        doc = self.portal["doc1"]
+        doc_uid = doc.UID()
+        resolve_uid_link = f"../resolveuid/{doc_uid}"
+        value = self.serialize(
+            context=self.portal.doc1,
+            blocks={
+                "1": {
+                    "@type": "teaser",
+                    "href": resolve_uid_link,
+                    "overwrite": True,
+                    "title": "Custom title",
+                    "description": "Custom description",
+                }
+            },
+        )
+
+        block = value["1"]
+        self.assertEqual(block["title"], "Custom title")
+        self.assertEqual(block["description"], "Custom description")
+        href = block["href"][0]
+        self.assertEqual(href["@id"], doc.absolute_url())
+
+    def test_teaser_block_serializer_legacy(self):
+        # no "overwrite" key -> default to True
+        doc = self.portal["doc1"]
+        doc_uid = doc.UID()
+        resolve_uid_link = f"../resolveuid/{doc_uid}"
+        value = self.serialize(
+            context=self.portal.doc1,
+            blocks={
+                "1": {
+                    "@type": "teaser",
+                    "href": [{"@id": resolve_uid_link}],
+                    "title": "Custom title",
+                    "description": "Custom description",
+                }
+            },
+        )
+
+        block = value["1"]
+        self.assertEqual(block["title"], "Custom title")
+        self.assertEqual(block["description"], "Custom description")
+        href = block["href"][0]
+        self.assertEqual(href["@id"], doc.absolute_url())