PD 4.0: Windows applications Dock icons sometimes not appearing in Coherence

I noticed that while in Coherence mode, if I launch a Windows software, the Dock icon of the software doesn't appear sometimes...

It's not happening systematically and a software that didn't have its icon appearing can have it appearing later if I restart Windows... As well as a software having its icon appearing may not have it appearing later...

Note that it's a PD 3.0 converted virtual machine, I didn't test a completely PD 4.0 clean one... If I have enough time for that, I may test that case one day.