Image Resolution reset/downsampled when using Firefly Generative Fill,

When uploading an imgae (5120px x 4096px) to Firefly Generative Fill for editing/testing, it is sampled/set at a far far lower resolution. when downloading the editied image the resolution is set at (4096 x 3276) instead of the original resolution. Why is this? Is there an image resolution limit to 4096x4096 or something? Alot of Professionals (especially in modern times on modern systems) work with resolutions far far larger than this. As a Geospatial Engineer the standard resolution some of us work on is 8192 x 8192 so a resolution cap would be a detrament to the entire Geospatial industy. Perhaps is this only because Firefly is still in Beta testing?