Deepin can present problems with the icons if it is executed together with other desktops.
The problem is due to the existence of the qt5ct application, that when we select Deepin as the desktop to install, qt5ct is not installed. To solve the problem, you would have to uninstall qt5ct.
qt5ct makes some Deepin icons not show up, and blue squares are shown instead.
Take this detail into account if you plan to install Deepin together with another desktop.