This bug keeps appearing in X3, X7 and now again in X8. Create a graphic in CorelDraw and apply a standard transparent lens to the object, export as a transparent PNG. It should be transparent so when used as a PNG it's a lens.
Currently it is exported as a solid. Time to find my CorelDRAW X5 CDs and install it so I can work on the graphic needed.
See below, the grey box has a lens of 50% applied to it, you can see this over the blue box. When exporting the rest of the grey box is a solid - it should be a PNG transparency.
Opened up X5, and it appears that the Lens does not working there either, but Transparency does. So that's the difference.
Can the team take a look at Lens and see what they behave differently when exporting to a transparent PNH.
Below is a screenshot of a transparent graphic in X5.
It works as designed