How avoid transparent transitions of images?

Hi all.

In my videos I use many times images with transitions over the video stream to show text, some images, etc.

Until the version 19.01.27 I have no problems, but I changed to last version (19.06.15) and now the images on the transition are transparent and the video beneath is visible.

The options in Shotcut in the prefs and config are the same in the two versions. The only difference that I can see is Qt 5.6.1 in the old build.

I am using now the old version of Shotcut, but, anyone knows how to make the old transitions without this new transparency?

Kemmotar