Content Aware Fill won't create any Fill

Hi, I’m trying to use Content Aware Fill, for the first time probably and it just won’t create any Fill for me. Not sure what I’m doing wrong, but I’v tried it as well on completly different footage and project and the problem persist.

1. I upload the footage
2. Create a Mask on the layer
3. Set the Mask on Subtract and sets Feather
4. Motion Tracker on Mask is not needed
5. The hole is visible in Comp and in Content Aware Fill
6. Clicks on Generate Fill Layer from Content Aware Fill
7. After approximately 6s a new fill layer appears, however without any fill or content
8. Immediatelly my CPU and RAM start going up until 100% (I have 64GB DDR4 RAM and i5-12600KF CPU)

CPU stops going crazy when I delete the new Fill layer and my RAM drops to like 80-90%, until I reopen the project again. There is no visible activity in After Effects and I even left it for a moment running on 100% to see, if something appear in After Effects, however nothing showed up. For most of the time I don’t encounter hardware limitations and never that kind of nonsense type.

Thank you for your time