It's not that nothing happened. It's that your child's brain is decompressing. Answering questions takes cognitive effort. Their response to "how was school?" is literally their brain saying "I'm tired, let me be."
Also, kids don't think like we do. They don't naturally narrate their day. What seems memorable to you (the class presentation) might be unmemorable to them. What they remember (a joke at lunch) seems trivial to you.
Different wiring, not rudeness. The conversation exists—you just need to ask differently.