If you will have project with 256 pixels resolution, create a group, that will have x4 resolution multiplier (1024 pixels in total) will update File Input node inside of it by draging own resolution multiplier slider and will try to export this as heightmap - your project will be crashed
I think WM 4041 just can not work with custom resolutions - because project is 256, group is 1024, and File input try to display 1024, but if you will just update it - it will not allow you to go upper than 256 and will lead to crash
