Memory issues?

My husband gave our 4yo cereal for breakfast and 3/4 of an apple sliced. About an hour later, I asked her if she had any fruit today and she literally had no memory of it. She kept saying “I don’t remember” and I tried to jog her memory by listing out some fruits (including apple) but she literally had no idea. It took her about 4 to 5 minutes to figure it out. I had to say to her “dada put some fruit right on the side of your plate for breakfast” and that’s when she exclaimed “apple!”

Is that concerning??