diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index b2aabd7da..a0305b5a8 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -879,7 +879,7 @@ impl Session {
         // The steps recorded while the group was open go with their edits (all of them when the
         // recording started inside the group).
         if let Some(rec) = self.recorder.as_mut() {
-            rec.cut_back(g.recorded.unwrap_or((0, 0)));
+            rec.cut_back(g.recorded.unwrap_or((0, 0)), g.doc);
         }
         // The record of the last group step stays when the document is back exactly where that
         // step left it (this group began there); otherwise the rollback is where the group ended.
diff --git a/crates/engine/src/record.rs b/crates/engine/src/record.rs
index f1a7e29e5..b0d28ef40 100644
--- a/crates/engine/src/record.rs
+++ b/crates/engine/src/record.rs
@@ -73,13 +73,18 @@ impl Recorder {
         (self.steps.len(), self.dropped)
     }
 
-    /// Takes back the steps recorded since `mark` (an undo group that recorded them was rolled
-    /// back, so playing them back would make edits the workbook no longer has).
-    pub(crate) fn cut_back(&mut self, (len, dropped): (usize, usize)) {
-        if self.steps.len() > len {
-            self.steps.truncate(len);
+    /// Takes back the steps recorded in the document with uid `doc` since `mark` (an undo group
+    /// on it was rolled back, so playing them back would make edits it no longer has). Steps in
+    /// other documents stay: their edits do too. Steps the buffer dropped stay counted.
+    pub(crate) fn cut_back(&mut self, (len, _): (usize, usize), doc: u64) {
+        let before = self.steps.len();
+        let mut i = 0;
+        self.steps.retain(|s| {
+            i += 1;
+            i <= len || s.doc != doc
+        });
+        if self.steps.len() != before {
             self.bytes = self.steps.iter().map(|s| serde_json::to_vec(s).map_or(0, |v| v.len())).sum();
         }
-        self.dropped = self.dropped.min(dropped);
     }
 }
diff --git a/crates/engine/src/tests/seams.rs b/crates/engine/src/tests/seams.rs
index 48d5abf4c..3fa37b100 100644
--- a/crates/engine/src/tests/seams.rs
+++ b/crates/engine/src/tests/seams.rs
@@ -844,6 +844,16 @@ fn stop_action_runs_only_on_its_own_and_is_not_recorded() {
     assert_eq!(s.execute("automate.stopAction", json!({})).unwrap(), json!({"stopped": true}));
     assert!(v(&s, "A3").is_empty());
     assert_eq!(recorded_ids(&s), ["cell.set", "cell.set"]);
+    // An edit recorded in another workbook while the group was open stays, as its edit does.
+    let first = s.active_index();
+    let _left = s.group_begin("Left open").unwrap();
+    set(&mut s, "A4", "four");
+    s.new_workbook();
+    set(&mut s, "B1", "other");
+    s.set_active(first);
+    assert_eq!(s.execute("automate.stopAction", json!({})).unwrap(), json!({"stopped": true}));
+    assert_eq!(recorded_ids(&s), ["cell.set", "cell.set", "cell.set"], "the other workbook's edit stays");
+    assert_eq!(s.recorder.as_ref().unwrap().steps.last().map(|st| st.params["cell"].clone()), Some(json!("B1")));
     assert_eq!(s.stop_recording().unwrap().dropped, 0);
 }