The paging functionality in Workbench incorrectly hides results when a subquery has a LIMIT clause. A query that has 9 results only shows 2 actual result rows:
but once the 'results per page' setting is manually modified, it correctly renders the result:
To reproduce, use the following data:
and this SPARQL query:
Notice that the query has a LIMIT-clause with value 2, but this limit only applies to the inner query.
See this StackOverflow question for more details.