Same thing happened to me with a LHR-HND flight. Fairly satisfied everything is okay given the ticket numbers are still in place everywhere I've checked (CMT, RJ, etc).JL changed my HEL-HND flight (updated to reflect avoiding Russian airspace it seems) and I received an email to accept the change in MMB, which I accepted. CMT shows the new flight with e-ticket number (unchanged from the previous one) but Qantas has not issued a new e-ticket. Is the consensus that this is OK? Or do I need Qantas to issue a new e-ticket.
Has reduced my connection time to a domestic JAL flight to 1h55m though. Not ideal, but still meets MCT and there's plenty of other flights I can be put on if I miss the connection.