Today I fully expanded my kingdom, after that, despite the fact that I have not maxed out on Explorer permits ( ZERO in my inventory) nor Expansion Permits ( 67 in my inventory) the crafts vanished from Royal exchange.
But since it is clear there will be more plots to open in near future- and I'm NOT maxed out - I should still be able to craft them for future!
Currently this is the last craft in Royal Exchange ( there should be 2 more after that)