[I] MERGE incorrectly creates multiple vertices [age]

[via GitHub]

mingfang opened a new issue, #1691:
URL: https://github.com/apache/age/issues/1691

   ```sql
   SELECT * FROM cypher('playground', $$
   unwind ["foo", "foo"] as each
   merge (v:TEST {name: each})
   return v
   $$) AS (v agtype)
   ```
   returns
   ```json
   [
     {
       "v": {
         "id": 3659174697238531,
         "label": "TEST",
         "properties": {
           "name": "foo"
         }
       }
     },
     {
       "v": {
         "id": 3659174697238532,
         "label": "TEST",
         "properties": {
           "name": "foo"
         }
       }
     }
   ]
   ```
   creates two vertices when it should only create one. (confirmed with neo4j)
   


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