I'm not sure why this is so but I found a really stupid workaround.
First, run PCC then right-click on Icon-Only Task Manager and open its Settings. Go to Launcher Matching Rules, click Add. For Laucher, click the Browse icon and More Applications > Configuration Configure Your Computer.
Next, open another instance of PCC. Click Detect Window Properties on the settings dialog and click on the second PCC window. You should get Drakconf.real/drakconf.real on Window Class/Window Name. Click OK. Close the original PCC. Click Show A Launcher When Not Running. Close the other PCC.
From that, I got this. Tried it and it launches PCC. I don't know if this will work after a reboot though.