HTTP Cookies and Sessions Since v17 Beta 3

In a PVR binary addon (pvr.zattoo), I’m using XBMC->CURLOpen(..) to communicate with the stream provider. On a specific request, the provider sets a session cookie which is used to identify the current session.

Earlier, this cookie was saved to cookies.dat and re-used over all future calls to the same host. Now since Beta 3, this cookies.dat has been removed. In general, this will simplify the addon as it does not have to store any session related date on the file system.
But now my problem is, that this session cookie is persisted for some time (less than a minute) and then it is dropped. Probably as soon as the HTTP connection is actually closed. As soon as this happens, the client is not logged in anymore and a bunch of requests are required to re-login.

Is this the expected behaviour?
If yes, how could I handle that? Is it possible to receive the cookies from the addon to resend them later?
If no, is this already on the list or shall I create a ticket?