Waking up crying from shorter naps all of a sudden?!

Is anyone else’s LO doing this right now? My LO used to be an great napper—his one nap would be between 2-3 hrs typically and he’d wake from it slowly and quietly without a fuss. Recently he’s been waking from his nap after only 1.5 hrs and he’ll cry and all of a sudden stand up in his crib. I’m like, what gives?? 😩 Would love to hear if this has happened to your LO and if it went back to normal eventually or if it’s still happening now 🫠