After any update, it's advisable to wipe the phones cache partition
You will need to plug into a working device or pc/laptop.
https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/You can try booting into safe mode to see if this overheating issue disappears.
Long press the power button, long press on the power icon. Tap safe mode icon. Your phone will restart in safe mode (you will still have WiFi, but you may need to turn off flight mode). Any 3rd party apps or customisations won't load. If the phone remains cool, then it's likely it may be caused by one of your 3rd party apps or customisations. You will need to pinpoint which, one by one.
If you still experience heating, then I'd recommend backing up your device, especially all your important files, and performing a full factory reset.
https://www.samsung.com/uk/support/mobile-devices/backing-up-and-restoring-data-on-my-galaxy/
