GIS DB query generates invalid SQL on two joins with the same table

[wardi]

from django.contrib.gis.db import models
from django.contrib.gis.geos import Point

class TestModel(models.Model):
    objects = models.GeoManager()

    point = models.PointField()

class RefModel(models.Model):
    objects = models.GeoManager()

    test1 = models.ForeignKey(TestModel, related_name="test1s")
    test2 = models.ForeignKey(TestModel, related_name="test2s")

bool(RefModel.objects.filter(test1__point=Point(1,0), test2__point=Point(2,0)))

causes a psycopg2.ProgrammingError: Missing FROM-clause entry for table "T3"

If point is a CharField or other non-GIS field there is no error. There is also no error if I don't use GeoManager instances (which is itself incorrect in this case).

[jbronn]

Duplicate of #11741. A patch will be available after multi-db lands.