Simperium error “member […] from diff not in change” when updating a relationship attribute from JS backend

[bayareacoder]

In IOS Core Data, I have an Item entity with a To-One relationship attribute named 'itemRelKiosk' that points to a Kiosk entity. I'm updating this relationship field from a Javascript backend by writing the simperiumKey value of the kiosk object I want to point to. The relationship property is of type string in JS.

I see on the Simperium data browser website that the value is correctly written. On the IOS side, when I clear the local data store and thus do a full indexing upon app startup, the relationship is correctly setup. But when there is a local datastore I get the error below and the relationship in Core Data shows as (null). I see the same with Simperium v0.6.8 and v0.7.5.
It seems IOS is receiving a 'd' operation (full object) and thus is expecting a replacement string, but is only receiving a diff string?

2014-12-04 20:40:41.158 AppClient[473:59649] Simperium () received "11:c:[{"sv": 28, "clientid":
"sjs-2014030401-a971a4f2ccf064ed31f1", "id": "85b0b6987cde15070b78", "o": "M", "v":
{"itemRelKiosk": {"o": "d", "v": "-9\t=2\t-8\t+9827ae7e6639b67b3\t=1"}}, "ev": 29, "cv":
"54813748a61f561034764f04", "ccids": ["2bb6436dd37de0298980d800fe5674cf"]}]"

2014-12-04 20:40:41.161 AppClient[473:59649] Simperium handling changes (Item) (
{
ccids = (
2bb6436dd37de0298980d800fe5674cf
);
clientid = "sjs-2014030401-a971a4f2ccf064ed31f1";
cv = 54813748a61f561034764f04;
ev = 29;
id = 85b0b6987cde15070b78;
o = M;
sv = 28;
v = {
itemRelKiosk = {
o = d;
v = "-9\t=2\t-8\t+9827ae7e6639b67b3\t=1";
};
};
})
2014-12-04 20:40:41.167 AppClient[473:59649] Simperium client ios-
0e26886f0859411882a543047f20d0a1 received change (Item) sjs-2014030401-a971a4f2ccf064ed31f1 [M]
: {
ccids = (
2bb6436dd37de0298980d800fe5674cf
);
clientid = "sjs-2014030401-a971a4f2ccf064ed31f1";
cv = 54813748a61f561034764f04;
ev = 29;
id = 85b0b6987cde15070b78;
o = M;
sv = 28;
v = {
itemRelKiosk = {
o = d;
v = "-9\t=2\t-8\t+9827ae7e6639b67b3\t=1";
};
};}
2014-12-04 20:40:41.170 AppClient[473:59649] Simperium received version = 28, previous version = 28
2014-12-04 20:40:41.176 AppClient[473:59649] Simperium error: member itemRelKiosk from diff wasn't in change
2014-12-04 20:40:41.178 AppClient[473:59649] Simperium MODIFIED ghost version 29 (Item-Item)
2014-12-04 20:40:41.179 AppClient[473:59649] Simperium non-local MODIFY ENTITY received
2014-12-04 20:40:41.197 AppClient[473:59649] Simperium applying diff: {
itemRelKiosk = {
o = d;
v = "-9\t=2\t-8\t+9827ae7e6639b67b3\t=1";
};
}