afs commented on issue #1933:
URL: https://github.com/apache/jena/issues/1933#issuecomment-1613050756

   It's not the same blank node. `BNODE("...")` is per row (solution mapping) 
at the point of execution and the two arms of UNION are different rows.
   
   ```
   CONSTRUCT { ?b <p> "x" } WHERE { BIND (BNODE("b1") AS ?b)  {} UNION {} }
   ```
   !=
   ```
   CONSTRUCT { ?b <p> "x" } WHERE { {} UNION {} BIND (BNODE("b1") AS ?b)  }
   ```


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