The error is due to the sample feature loading cache throwing an exception because no feature is found yet:
com.google.common.cache.CacheLoader$InvalidCacheLoadException: CacheLoader returned null for key WSF_2019.
at com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2315)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2279)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2155)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
at com.google.common.cache.LocalCache.get(LocalCache.java:3951)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4935)
at org.geoserver.ogcapi.stac.SampleFeatures.getSample(SampleFeatures.java:69)
at org.geoserver.ogcapi.stac.STACOseoListener.getQueryablesMap(STACOseoListener.java:208)
at org.geoserver.ogcapi.stac.STACOseoListener.handleCollectionsUpdateEvent(STACOseoListener.java:112)
at org.geoserver.ogcapi.stac.STACOseoListener.dataStoreChange(STACOseoListener.java:72)
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