webinspector_receive_with_timeout returns WEBINSPECTOR_E_PLIST_ERROR if message too long

libimobiledevice 1.1.5
libplist 1.10
usbmuxd 1.0.8

I successfully use webinspector service with mobile safari. But I think, that there is a bug, when I try to receive bigger message.

For instance if I send:
{id":183,"method":"CSS.getMatchedStylesForNode","params":{"nodeId":26,"includeInherited":true,"includePseudo

And now I want to read:
webinspector_error_t res = webinspector_receive_with_timeout(client, &plist, timeout_ms);

The result is WEBINSPECTOR_E_PLIST_ERROR in this case. I think, that the problem is, that the massage is too big.

My software also works with iOS Simulator. I use different communication mechanism with Simulator and I don't have such problems.
I'm attaching output of what I'm getting from iOS Simulator, which should be the same (or similar) as from device.

iossim.plist is expected result. This specific response I'm getting from iOS Simulator.
iossim.json is json decoded from previous plist.

Thanks,
Jan