Doctrine collections are overwritten when created by inner join queries that agree on the WHERE

In brief:
Doing $result1 = Doctrine_Query::create()>... followed by $result2 = Doctrine_Query::create()>... can lead to a situation where the content of $result1 has become the value in $result2.

In detail:
The attached models.yml defines two simple tables with a One-to-Many relationship; we have people and names and each person can have multiple names. The DB can be propagated along the lines of:

INSERT INTO `tblname` VALUES (1,1,'alpha'),(2,2,'beta'),(3,3,'gamma'),(4,4,'delta'),(5,5,'epsilon'),(6,1,'aleph');
INSERT INTO `tblperson` VALUES (1),(2),(3),(4),(5);

Applying the query:

$results1 = Doctrine_Query::create()
->from('Person ppa')
->innerJoin('ppa.Name n')
->where('ppa.id = ?', 1)
->andWhere('n.text = ?', 'alpha')
->execute()
->getFirst()
->Name;

and then producing output though

print 'Results (1): '.count($results1)."\n";
foreach ($results1 as $result) print $result['text'] . "\n";
print "\n\n";

produces the expected:

Results (1): 1
alpha

Doing a similarly query to a new variable:

$results2 = Doctrine_Query::create()
->from('Person ppa')
->innerJoin('ppa.Name n')
->where('ppa.id = ?', 1)
->andWhere('n.text = ?', 'aleph')
->execute()
->getFirst()
->Name;

and printing with

print 'Results (2): '.count($results2)."\n";
foreach ($results2 as $result) print $result['text'] . "\n";
print "\n\n";

produces the expected:

Results (2): 1
aleph

but printing out the first result object again at this point gives:

Results (1): 1
aleph

which is unexpected - "aleph" rather than "alpha".

If, the second query was altered to

->where('ppa.id = ?', 2)
->andWhere('n.text = ?', 'beta')

then all three output results are as expected.

test.zip contains corresponding test files.