Confirmed here as well. Looks like DUNE sees banks as 128 patch files rather than the whole 384 patch memory. Perhaps a Save/Load All option is needed?
EDIT: Like Krim I did manage to get two banks to save/load ....Banks A and C oddly enough....
This time I got B and C to load by having B active....looking more and more like a Bug at this point..or a limitation in the VST specs.....