I noticed it after reading this post and checked if I had the same issue, I had already updated to 3.28 so it's certainly possible. "Default" just doesn't seem to do anything with the fan RPM anymore. I let a game run until temps got high and it will go instantly to max RPM eventually when things get hot. But nothing in between. It's definitely fairly recent behavior, and I stay pretty up to date on iCUE in general. Custom and extreme both work.