Gh-2840: MapStore MatchedVertex inconsistent #1312

Job	Run time
Tests (Core, :gaffer2,:core,:access,:cache,:common-util,:data,:exception,:graph,:operation,:seria...	3m 50s
Tests (Accumulo, :accumulo-store,:accumulo-rest)	11m 49s
Tests (Federated-And-Map, :integration-test,:federated-store,:map-store,:map-rest,:simple-federat...	2m 5s
Tests (REST, :rest-api,:common-rest,:spring-rest,:core-rest,:store-implementation,:proxy-store)	2m 17s
Tests (Examples, :example,:basic,:basic-model,:basic-rest,:road-traffic,:road-traffic-model,:road...	3m 0s
Tests (Big-Data-Libraries, :flink-library,:hdfs-library,:spark,:spark-library,:spark-accumulo-lib...	7m 37s
Tests (Time-Library, :library,:time-library)	1m 1s
Tests (Caches, :cache-library,:sketches-library,:bitmap-library,:hazelcast-cache-service,:jcs-cac...	1m 52s
	33m 31s

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