Can you count your broken extensions?
Official guide for extension maintainers: https://gjs.guide/extensions/upgrading/gnome-shell-45.html
Were you running X11 apps? I think there's issues with low res on X11, but Wayland apps should be running at integer scaling and then scaling down to whatever fractional scale you've set it to.
The beloved lightweight distro
Were you running X11 apps? I think there's issues with low res on X11, but Wayland apps should be running at integer scaling and then scaling down to whatever fractional scale you've set it to.