Fixed #30477 -- Made reverse lookup use Field.get_db_prep_value() from the target field.

tests/queries/models.py

@@ -67,10 +67,15 @@ class Annotation(models.Model):
         return self.name
 
 
+class DateTimePK(models.Model):
+    date = models.DateTimeField(primary_key=True, auto_now_add=True)
+
+
 class ExtraInfo(models.Model):
     info = models.CharField(max_length=100)
     note = models.ForeignKey(Note, models.CASCADE, null=True)
     value = models.IntegerField(null=True)
+    date = models.ForeignKey(DateTimePK, models.SET_NULL, null=True)
 
     class Meta:
         ordering = ['info']