Gradual infill infill holes mid-air

[endre 0]

The center area is a hole which is infilled mid-air. Version: 4.8.0

 

[endre 0]

As I see not the "Gradual Infill" causes this anomaly, but the "Infill Support".

[fvrmr 73]

Can you share your project file? So I can gave a better look at it. 

[gr5 2,069]

To share your project file: go to menu "file" "save...".  The resulting file contains not only your STL but the scaling, positioning.  Also it has your machine (printer) settings, your material settings, your profile used, and settings that you overrode.  Please post that here.