Main menu entries created with Alacarte - No icons in dock

I created several main menu entries with Alacarte. I added an icon and I can perfectly see the icon in my application overview. When I open the application, I cannot see the application icon in the dock and also the context menu after a click does not show "New Windows" and "Add to Favorites".

This is an example for a entry created by Alacarte:

[Desktop Entry]
Name=Radix Wallet
Exec=/home/martin/.Software/Radix-Wallet-1.2.5.AppImage
Comment=
Terminal=false
Icon=/home/martin/.Software/Radix-DLT-logo.jpg
Type=Application

Here are some screenshots:

Solution 1:

Try specifying the correct wmclass in the .desktop launcher.

Launch the application. Then determine the window class by running xprop | grep WM_CLASS. This returns something like

WM_CLASS(STRING) = "", ""

Add a line to your `.desktop launcher that specifies its class name as:

StartupWMClass=<Class Name>

where <Class Name> should be replaced by the actual output of xprop.