diff --git a/src/tree_data.c b/src/tree_data.c
index 60a17b5..cb7a581 100644
--- a/src/tree_data.c
+++ b/src/tree_data.c
@@ -2480,7 +2480,7 @@
     struct lyd_node **match_p, *first, *iter;
     struct lyd_node_inner *parent;
 
-    LY_CHECK_ARG_RET(NULL, target, lysc_is_dup_inst_list(target->schema), set, LY_EINVAL);
+    LY_CHECK_ARG_RET(NULL, target, set, LY_EINVAL);
     LY_CHECK_CTX_EQUAL_RET(siblings ? LYD_CTX(siblings) : NULL, LYD_CTX(target), LY_EINVAL);
 
     LY_CHECK_RET(ly_set_new(set));
diff --git a/src/tree_data.h b/src/tree_data.h
index 0f8db3f..53e18a5 100644
--- a/src/tree_data.h
+++ b/src/tree_data.h
@@ -2391,8 +2391,8 @@
         const char *key_or_value, size_t val_len, struct lyd_node **match);
 
 /**
- * @brief Search the given siblings for all the exact same instances of a specific node instance. Accepts only nodes
- * that are allowed to have several exact same instances. Uses hashes to whatever extent possible.
+ * @brief Search the given siblings for all the exact same instances of a specific node instance.
+ * Uses hashes to whatever extent possible.
  *
  * @param[in] siblings Siblings to search in including preceding and succeeding nodes.
  * @param[in] target Target node instance to find.
diff --git a/src/tree_data_common.c b/src/tree_data_common.c
index 8f087b2..f6a53c9 100644
--- a/src/tree_data_common.c
+++ b/src/tree_data_common.c
@@ -73,12 +73,13 @@
 {
     struct lyd_dup_inst *dup_inst;
 
-    if (!*inst || !lysc_is_dup_inst_list((*inst)->schema)) {
-        /* no match or not dup-inst list, inst is unchanged */
+    if (!*inst) {
+        /* no match, inst is unchanged */
         return LY_SUCCESS;
     }
 
-    /* there can be more exact same instances and we must make sure we do not match a single node more times */
+    /* there can be more exact same instances (even if not allowed in invalid data) and we must make sure we do not
+     * match a single node more times */
     dup_inst = lyd_dup_inst_get(*inst, dup_inst_cache);
     LY_CHECK_ERR_RET(!dup_inst, LOGMEM(LYD_CTX(siblings)), LY_EMEM);