Guys... ALWAYS keep a copy of the Finnair chat log. If the "Save transcript" doesn't work (it didn't for me), copy the contents of the chat manually and save them somewhere else.
Having some issues with yet another rebooking (apparently some OTA had confirmed a schedule change on my behalf without ever contacting me) and basically the only thing that's currently giving me at least some hope that I'll be able to rebook again is that I had kept records of all chat conversations.