diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index ed53ad2a50..2dd652263d 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -9507,3 +9507,26 @@ fn repeated_backdrop_artwork_survives_background_undo_redo_and_both_save_modes()
     s.apply(rewritten, Edit::RemoveMarks { kind: MarkKind::Background }).unwrap();
     black(&s, rewritten);
 }
+
+/// A reset in an opening script reaches a field of a row an earlier opening script added, before
+/// the form is laid out again with the row's widgets: its data goes back to its default and stays
+/// so when the form is saved.
+#[test]
+fn an_opening_reset_reaches_a_row_added_while_opening() {
+    let tpl = pdfcraft_xfa::fixtures::scripted_template().replace(
+        "if (qty.rawValue === null) qty.rawValue = 2;",
+        r#"if (qty.rawValue === null) qty.rawValue = 2; table._row.addInstance(1);"#,
+    )
+    .replace(
+        r#"<field name="grand" w="2in" h="0.3in" access="readOnly">"#,
+        r#"<field name="grand" w="2in" h="0.3in" access="readOnly"><event activity="initialize"><script contentType="application/x-javascript">xfa.resolveNode("form.page1.table.row[1].item").rawValue = "X"; xfa.host.resetData("form.page1.table.row[1].item");</script></event>"#,
+    );
+    let mut s = Session::new().with_clock(|| 1_700_000_000);
+    let id = s.open("rows.pdf", None, Arc::new(pdfcraft_xfa::fixtures::shell(&tpl)), None).unwrap();
+    let out = s.take_js_output(id);
+    assert!(out.errors.is_empty(), "{:?}", out.errors);
+    let cos = pdfcraft_cos::Document::open(s.save_bytes(id).unwrap()).unwrap();
+    let data = pdfcraft_xfa::data_of(&cos).unwrap();
+    assert_eq!(data.count(&pdfcraft_xfa::som_to_path("form[0].page1[0].table[0]"), "row"), 2, "the row was added");
+    assert_eq!(data.text_at(&pdfcraft_xfa::som_to_path("form[0].page1[0].table[0].row[1].item[0]")).unwrap_or(""), "", "reset in the data");
+}
diff --git a/crates/engine/src/xfa.rs b/crates/engine/src/xfa.rs
index fd1249df2d..d0b674bc04 100644
--- a/crates/engine/src/xfa.rs
+++ b/crates/engine/src/xfa.rs
@@ -590,7 +590,34 @@ impl<'a, 'b> Runner<'a, 'b> {
         } else {
             Some(by_som.iter().filter(|(som, _)| names.iter().any(|n| som_matches(som, n))).map(|(_, f)| f.clone()).collect())
         };
+        // Fields of the live form with no widget yet (a row an opening script added, before the
+        // form is laid out again): their data goes back to the template's default too, or the
+        // value would stay and be laid out and saved.
+        let unshown: Vec<String> = {
+            let live = self.live();
+            let mut out = Vec::new();
+            let mut stack: Vec<&pdfcraft_xfa::FormNode> = vec![&live.root];
+            while let Some(n) = stack.pop() {
+                if n.kind == Some(pdfcraft_xfa::NodeKind::Field)
+                    && !by_som.contains_key(&n.som)
+                    && (names.is_empty() || names.iter().any(|name| som_matches(&n.som, name)))
+                {
+                    out.push(n.som.clone());
+                }
+                stack.extend(n.children.iter());
+            }
+            out
+        };
+        for som in unshown {
+            let Some(text) = pdfcraft_xfa::reset_default(self.tpl, &som) else { continue };
+            let path = pdfcraft_xfa::data_path(self.tpl, &som);
+            if self.data.as_ref().and_then(|d| d.text_at(&path)).unwrap_or("") != text {
+                self.data_op(pdfcraft_xfa::DataOp::Value { path, text });
+                self.changes.values += 1;
+            }
+        }
         if listed.as_ref().is_some_and(Vec::is_empty) {
+            self.invalidate();
             return Ok(());
         }
         pdfcraft_forms::reset(self.doc, listed.as_deref()).map_err(|e| e.to_string())?;
diff --git a/crates/xfa/src/lib.rs b/crates/xfa/src/lib.rs
index 7e63218c90..811e2f4de3 100644
--- a/crates/xfa/src/lib.rs
+++ b/crates/xfa/src/lib.rs
@@ -103,7 +103,7 @@ pub use pdf::{CLICK_KEY, LAYOUT_KEY, NODE_KEY, SOM_KEY, Stripped, XfaShape, exis
 pub use picture::typed_date;
 pub use script::{
     FormNode, LiveForm, MAX_FORM_NODES, NodeKind, OVERRIDES_KEY, Overrides, ScriptEvent, apply_overrides, data_of, field_grows_with_text,
-    fields_by_som, form_tree, has_scripts, overrides, refresh_value, rerender, set_overrides, template_of,
+    fields_by_som, form_tree, has_scripts, overrides, refresh_value, rerender, reset_default, set_overrides, template_of,
 };
 
 #[derive(Debug, thiserror::Error)]
diff --git a/crates/xfa/src/script.rs b/crates/xfa/src/script.rs
index 6946aa9b1c..f0906a603a 100644
--- a/crates/xfa/src/script.rs
+++ b/crates/xfa/src/script.rs
@@ -575,6 +575,17 @@ pub fn fields_by_som(doc: &Document) -> HashMap<String, String> {
     out
 }
 
+/// What a reset gives the field at `som` in the data: its template default, or nothing when it has
+/// none. `None` for an object a reset restores no value of: not a field of the template, or a
+/// button, signature or picture field.
+pub fn reset_default(tpl: &Template, som: &str) -> Option<String> {
+    let f = crate::data::template_field(tpl, som)?;
+    if matches!(f.ui, crate::model::Ui::Button | crate::model::Ui::Signature | crate::model::Ui::ImageEdit) {
+        return None;
+    }
+    Some(f.value.plain().unwrap_or_default())
+}
+
 /// Lay the form out again from its template, data and overrides, replacing the pages and the
 /// generated fields (a script added a row or hid a subform).
 pub fn rerender(doc: &mut Document, tpl: &Template) -> Result<Report, XfaError> {