diff --git a/crates/loro-internal/src/encoding/fast_snapshot.rs b/crates/loro-internal/src/encoding/fast_snapshot.rs
index e5a9f6c7..11e62a83 100644
--- a/crates/loro-internal/src/encoding/fast_snapshot.rs
+++ b/crates/loro-internal/src/encoding/fast_snapshot.rs
@@ -157,6 +157,10 @@ impl OpLog {
 }
 
 pub(crate) fn encode_snapshot<W: std::io::Write>(doc: &LoroDoc, w: &mut W) {
+    // events should be emitted before encode snapshot
+    assert!(doc.drop_pending_events().is_empty());
+    let old_state_frontiers = doc.state_frontiers();
+    let was_detached = doc.is_detached();
     let mut state = doc.app_state().try_lock().unwrap();
     let oplog = doc.oplog().try_lock().unwrap();
     let is_gc = state.store.gc_store().is_some();
@@ -169,11 +173,7 @@ pub(crate) fn encode_snapshot<W: std::io::Write>(doc: &LoroDoc, w: &mut W) {
         return;
     }
     assert!(!state.is_in_txn());
-    assert_eq!(oplog.frontiers(), &state.frontiers);
-
     let oplog_bytes = oplog.encode_change_store();
-    state.ensure_all_alive_containers();
-
     if oplog.is_trimmed() {
         assert_eq!(
             oplog.trimmed_frontiers(),
@@ -181,6 +181,15 @@ pub(crate) fn encode_snapshot<W: std::io::Write>(doc: &LoroDoc, w: &mut W) {
         );
     }
 
+    if was_detached {
+        let latest = oplog.frontiers().clone();
+        drop(oplog);
+        drop(state);
+        doc.checkout_without_emitting(&latest).unwrap();
+        state = doc.app_state().try_lock().unwrap();
+    }
+
+    state.ensure_all_alive_containers();
     let state_bytes = state.store.encode();
     _encode_snapshot(
         Snapshot {
@@ -190,6 +199,12 @@ pub(crate) fn encode_snapshot<W: std::io::Write>(doc: &LoroDoc, w: &mut W) {
         },
         w,
     );
+
+    if was_detached {
+        drop(state);
+        doc.checkout_without_emitting(&old_state_frontiers).unwrap();
+        doc.drop_pending_events();
+    }
 }
 
 pub(crate) fn encode_snapshot_at<W: std::io::Write>(
diff --git a/crates/loro-internal/src/loro.rs b/crates/loro-internal/src/loro.rs
index fe88a843..3ee7d3f4 100644
--- a/crates/loro-internal/src/loro.rs
+++ b/crates/loro-internal/src/loro.rs
@@ -44,7 +44,7 @@ use crate::{
     undo::DiffBatch,
     utils::subscription::{SubscriberSet, Subscription},
     version::{shrink_frontiers, Frontiers, ImVersionVector},
-    HandlerTrait, InternalString, ListHandler, LoroError, MapHandler, VersionVector,
+    DocDiff, HandlerTrait, InternalString, ListHandler, LoroError, MapHandler, VersionVector,
 };
 
 pub use crate::encoding::ExportMode;
@@ -546,11 +546,9 @@ impl LoroDoc {
         }
     }
 
-    pub(crate) fn drop_pending_events(&self) {
-        let _events = {
-            let mut state = self.state.lock().unwrap();
-            state.take_events()
-        };
+    pub(crate) fn drop_pending_events(&self) -> Vec<DocDiff> {
+        let mut state = self.state.lock().unwrap();
+        state.take_events()
     }
 
     #[instrument(skip_all)]
diff --git a/crates/loro/tests/loro_rust_test.rs b/crates/loro/tests/loro_rust_test.rs
index 86026525..be25da4d 100644
--- a/crates/loro/tests/loro_rust_test.rs
+++ b/crates/loro/tests/loro_rust_test.rs
@@ -1729,3 +1729,21 @@ fn change_peer_id() {
     doc.set_peer_id(4).unwrap();
     assert_eq!(received_peer_id.load(Ordering::SeqCst), 3);
 }
+
+#[test]
+fn test_encode_snapshot_when_checkout() {
+    let doc = LoroDoc::new();
+    doc.get_text("text").insert(0, "Hello").unwrap();
+    doc.commit();
+    let f = doc.state_frontiers();
+    doc.get_text("text").insert(5, " World").unwrap();
+    doc.commit();
+    doc.checkout(&f).unwrap();
+    let snapshot = doc.export(loro::ExportMode::snapshot());
+    let new_doc = LoroDoc::new();
+    new_doc.import(&snapshot).unwrap();
+    assert_eq!(
+        new_doc.get_deep_value().to_json_value(),
+        json!({"text": "Hello World"})
+    );
+}