A quick-and-easy way to fix an aspect of an area of interest (AOI) is to paste pixels from one location to another in Copy mode.
To repair an area of interest in Copy mode
Alternatively, you can also open a custom or project file set, and then copy an AOI from a file of the set.
You can further adjust the blend width to suit. If necessary, you can also adjust the color balancing or exposure correction to match the inside of the polygon to the outside.

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