I realise they've changed the system regarding Traces, but when I logged in last weekened I still had all of my ongoing stacks( I've had workers moining for hem for the last two years. ) I lofg in today and notice my banks are empty of them save 1 that has a small( considerbaly so compared to my stacks ) stack. Did they just delete them and not even bother converting them?

They're in your Heidel storage. It mentioned it in the patch notes.