@s7habo I have compiled new AppImage packages using GEGL 0.4.14 (apparently the same version used by Arch). Could you please test them and see if they behave correctly?
The links:
https://github.com/aferrero2707/gimp-appimage/releases/download/continuous/GIMP_AppImage-release-2.10.10-x86_64.AppImage
https://github.com/aferrero2707/gimp-appimage/releases/download/continuous/GIMP_AppImage-git-2.10.11-20190413-x86_64.AppImage