diff --git a/pkg/services/object_manager/placement/cache.go b/pkg/services/object_manager/placement/cache.go
index 217261877..d3f099245 100644
--- a/pkg/services/object_manager/placement/cache.go
+++ b/pkg/services/object_manager/placement/cache.go
@@ -44,7 +44,7 @@ func (c *ContainerNodesCache) ContainerNodes(nm *netmapSDK.NetMap, cnr cid.ID, p
 		raw, ok := c.containerCache.Get(cnr)
 		c.mtx.Unlock()
 		if ok {
-			return raw, nil
+			return c.cloneResult(raw), nil
 		}
 	} else {
 		c.lastEpoch = nm.Epoch()
@@ -67,3 +67,14 @@ func (c *ContainerNodesCache) ContainerNodes(nm *netmapSDK.NetMap, cnr cid.ID, p
 	c.mtx.Unlock()
 	return cn, nil
 }
+
+func (c *ContainerNodesCache) cloneResult(nodes [][]netmapSDK.NodeInfo) [][]netmapSDK.NodeInfo {
+	result := make([][]netmapSDK.NodeInfo, len(nodes))
+	for repIdx := range nodes {
+		result[repIdx] = make([]netmapSDK.NodeInfo, len(nodes[repIdx]))
+		for nodeIdx := range nodes[repIdx] {
+			result[repIdx] = append(result[repIdx], nodes[repIdx][nodeIdx])
+		}
+	}
+	return result
+}