I fixed this, but the behavior seems to be a bug.--
I was making the request, and right after making it, I was calling some code which does History.fireCurrentHistoryState(); to handle the current url token (this happens on first page load, within the entryPoint).
So 1) making the request, then 2) Doing History.fireCurrentHistoryState(); 3) while in the entry point, appears to reset the callbacks of the rpc request made in step 1 and doesn't call the callbacks.
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