You need to give feedback report to Samsung or it won't get fixed.

You're not alone

Thank you for writing this. I couldn’t agree more with every point you’ve made. The temperature difference and battery life improvement was evident in beta 1. Vulkan in One UI Beta 1 was a major upgrade—smoother animations, better gaming, and cooler ...

Ultra has more surface area to dissipate heat. That's why you don't realise it. Track your battery drain and, you'll understand why so many people are complaining.

Once they release a new phone, the previous model owners get treated like peasants.