Full round shape and route keepout problem

There is an issue that I encounter quite often when using full round shapes. As you can see in the images below, the shape (green) is drawing some kind of fillets in the edges of the route keepout shape (pink).
This does not happen every time. On the second picture, you can see that the shape is not generating copper inside of the route keepout.
Both images are 0603 capacitors (our footprint has a route keepout between the pads). Both GND shapes have the exact same parameters (I copied the shape with no error to create the shape with an error). Orientation of the component doesn't change anything. I tried updating the shape, updating all shapes (from DRC window), updating DRCs, I did a DBdoctor check, I tried changing constraints...

I am using Allegro 17.2

Why are shapes randomly filleting inside route keepout ? How can I prevent that ?

Thank you.