Handling huge polygons

[Loutreee]

Hello !

I am working with very large images (between 15,000 and 20,000 pixels in height and width).
I have an annotated image set that appears correctly annotated in annotation tools.

To train a model, I need to crop them into 2048-pixel images. Everything works pretty well, except for one polygon that takes up a lot of space on the original image (80% of the height), which ends up not being properly annotated after being cropped by SAHI.

I have double-checked multiple times to ensure that my base annotations are correct, and they are. I cannot share the images for confidentiality reasons, so I made a drawing instead!

If you have any idea to help me !