diff --git a/changelog.d/19464.bugfix b/changelog.d/19464.bugfix
new file mode 100644
index 0000000000..147e0b6ec7
--- /dev/null
+++ b/changelog.d/19464.bugfix
@@ -0,0 +1 @@
+Fix `/sync` `timeline` state duplicated in `state` when lazy-loading.