Add missing clone.

src/lib/situations.ts

@@ -50,8 +50,9 @@ export function buildTestCasesWithoutNonInputVariables(
   testCases: Situation[],
 ): Situation[] {
   const entities = Object.values(entityByKey)
-  const situations = [...testCases]
-  for (const [situationIndex, situation] of situations.entries()) {
+  testCases = [...testCases]
+  for (let [situationIndex, situation] of testCases.entries()) {
+    situation = testCases[situationIndex] = { ...situation }
     const inputInstantsByVariableName =
       inputInstantsByVariableNameArray[situationIndex]
     for (const entity of entities) {