$exists operator results in empty objects

[gepo]

In 1.0.0-BETA12 operator $exists make strange behavior:

    ->findBy(['catched' => ['$exists' => false]])

returns object with not filled fields, but if I use

    ->findBy(['userId' => 123])

returned objects are correct.
I revert doctrine-odm to 1.0.0-BETA11 and $exists works correctly.

I suppose that it's because of this change: #956