Normalize projected collection history evidence

internal/engine/history_source.go

@@ -151,6 +151,20 @@ func (builder *historyBuilder) sourceContributions(path Path, summary Origin) []
 		if !ok || !sourceLocationsContainedBy(attribution.origin, summary) {
 			continue
 		}
+		if observation.payload.id < 0 || observation.payload.id >= len(builder.model.sourcePayloads) {
+			continue
+		}
+		payload := builder.model.sourcePayloads[observation.payload.id]
+		if payload.kind != historySourceApplicationPayload {
+			continue
+		}
+		local, ok := historyApplicationLocalPath(payload.application, path)
+		if !ok {
+			continue
+		}
+		if _, exists := documentAtPath(payload.application.value, local); !exists {
+			continue
+		}
 		if _, exists := seen[observation.payload]; exists {
 			continue
 		}