i dont know if it helps, but if i recall correctly in unity was a similar bug 
and it was resolved. 
Now in unity you see the secuence for any app of libreoffice
1.- Click in application
2.- In the dock, opens the white icon 
3.- When app start, the dock show the correct icon.

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https://bugs.launchpad.net/bugs/1749590

Title:
  [snap] All open windows are grouped under one single icon in the dock

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