[AllureStep("...")]
public async Task EnsureDeletedStep(string itemCode)
{ ... }

System.ArgumentNullException : Value cannot be null. (Parameter 'key')
---
Stack Trace:
ThrowHelper.ThrowArgumentNullException(String name)
ConcurrentDictionary`2.TryGetValue(TKey key, TValue& value)
ConcurrentDictionary`2.get_Item(TKey key)
AllureStorage.Get[T](String uuid)
AllureStorage.AddStep(String parentUuid, String uuid, StepResult stepResult)
AllureLifecycle.StartStep(String parentUuid, String uuid, StepResult stepResult)
AllureLifecycle.StartStep(String uuid, StepResult result)
AllureStepAspect.WrapStep(String name, MethodBase methodBase, Object[] arguments, Func`2 method)
...