I'm glad xembedsniproxy is now included in Plasma.
However there is a problem - no icons at all, just empty placeholders.

Reproducible: Always

Steps to Reproduce:
1. Login to Plasma 5
or
1. Try to start xembedsniproxy manually

Actual Results:  
$  ~  xembedsniproxy
kde.xembedsniproxy: starting
kde.xembedsniproxy: Manager selection claimed
kde.xembedsniproxy: trying to dock window  37748883
kde.xembedsniproxy: adding damage watch for  37748883
kde.xembedsniproxy: trying to dock window  37748886
kde.xembedsniproxy: adding damage watch for  37748886
kde.xembedsniproxy: trying to dock window  50331671
kde.xembedsniproxy: adding damage watch for  50331671
kde.xembedsniproxy: trying to dock window  37748889
kde.xembedsniproxy: adding damage watch for  37748889
kde.xembedsniproxy: trying to dock window  35651601
kde.xembedsniproxy: adding damage watch for  35651601
kde.xembedsniproxy: Skip transparent xembed icon for 37748883 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 37748886 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 50331671 "redshift-gtk"
kde.xembedsniproxy: Skip transparent xembed icon for 37748889 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 35651601 ""
kde.xembedsniproxy: Skip transparent xembed icon for 37748883 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 37748886 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 50331671 "redshift-gtk"
kde.xembedsniproxy: Skip transparent xembed icon for 37748889 "chromium"
kde.xembedsniproxy: Skip transparent xembed icon for 35651601 ""
^C

And no legacy icons on Tray (just empty spaces for them)

Expected Results:  
Icons should be displayed correctly instead of empty spaces.