So I ran to the edge of the map and found an abrupt end to the world suggesting it had been chopped ?? Also standing on the edge of the map I noted my coords were -4096 which is consistent with Z1 suggesting furthermore that the map size was 8x8.

Surely if this was 10x10 we would expect a negative max to be around -5120?

Has Z2 been chopped and is its size still only 8x8?