I've seen your various posts on this and I never answer because I don't understand the issue and/or have any problem that I've specifically noticed - Big picture tells me you do an overdub (or possibly a manual split) and it doesn't crossfade but I don't even have that overlap option set and an overdub (or manual split) crossfades automatically - Here I recorded over the original take and it crossfaded:
I'm certain mine cross-faded because the option above it is checked "create automatic fade... for new items". I don't have much time to test just wanted to chime in.