Polar Coordinates Filter: 1 pixel seam

[stonebe]

The Polar Coordinates Filter sometimes leaves a 1 pixel seam. This often occurs after editing an image which consists of two layers which are merged to one layer. The gap can be avoided by marking the "Map backwards" option. However, this workaround sometimes enforces another correction afterwards. Is there a known approach to handle (i.e. avoid) this 1 pixel seam problem?

Im currently using Gimp 2.10 on macOS Big Sur Version 11.1.