Looks like this Island has been removed:
Is it because of the network size? I checked https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/PrepareRoutingSubnetworks.java and would like to know what is actually the unit of minNetworkSize? The javadoc talks about nodes but I I would guess that the island has more than 200 nodes (If the default value was used for preparation).
Same happened in my import so I would rule out a temporary data problem.