After my Buffer gets space again, does it fill up again with tweets from ifttt?

I’m wondering what happens with the favourited tweets that ifttt.com pulls in from my twitter account and forwards to bufferapp.com once my Buffer is full? When my Buffer gets emptier, does it automagically fill up again with those scheduled tweets via ifttt.com? Or are they lost forever? Or do I need to un-favourite and then re-favourite them again? Or what?