So finally in this build, extensions got completely disabled to avoid any bugs (I understand).
But in this process, "User Theme" extension is also disabled due to which the desktop is not looking as what it should look.
Fix was to open kvantum manager and select "Sweet" theme and not the sweetified one.
Also when installing, the pictures which appears in calamares where kinda bugged. It was a pic in between surrounded with very big white borders. Maybe my system specific. (Could not get screenshot of that)
If you guys can replace it with “Sweet-Dark-v40” it would be great (if you go in https://www.gnome-look.org/p/1253385/ and check) because it specifically says it is compatible with gnome 40 shell. Also we can see changelogs, they fixed some bugs so might be good.
And this theme should be enabled in shell theme for correct look and fixing visual glitches. (and for that user theme extension need to be enabled)
Im not experiencing that wierd visual bugs now with this theme, also a bug was there in which the cross button of windows (in the activities view) cuts in half, it also seems to fixed applying this latest version.
Developers please see into it and maybe update it.
Thanks so much.