Cannot mix incompatible Qt library (5.15.3) with this version (5.15.2)

[ishaan2479]

Kscreenlocker broken after qt5 5.15.3 updates on experimental

I’ve managed to fix the issue by reinstalling qt with pamac install qt5 and all proposed plasma packages.

sudo pacman-mirrors -f 5 
sudo pacman -S qt5
sudo pacman -Syyu

Edit - Also rebuild qt5-styleplugins package if you are experiencing this issue with any AUR package:

pamac build qt5-styleplugins