The response from a typical Relay query looks like this:
{
"data":{…},
"errors":[
"Field error name: __typename unknown error: Invalid call to Value::release for MapType",
...
]
}
And the console error you get in Relay looks like this:
'RelayResponseNormalizer(): Expected a typename for record `{'
Since I backported this to v1.2 it affects v1.2.0 and v2.0.0.