I tried reproducing this in Max 2022 and 2023, Corona 8 HF2 and the 05.08 V9 daily, but everything is working as expected. I tried doing things like regular rendering, IR, creating new materials, editing material values with IR on and off, it works the same way with the connection on and off. If you are able to somehow reproduce it, please report it to us and we will try to find out what may be wrong.