This is solved. World spawn is only active if on person in OPed. Being the only OP person on the server I caused the spawn protection to turn off upon deOPing myself.
Confirmed again this morning with another player who has never been oped on the server. It seems as there is no spawn protection.
This is solved. World spawn is only active if on person in OPed. Being the only OP person on the server I caused the spawn protection to turn off upon deOPing myself.