@ mazeckenrode
Obviously our needs are very different. All I require is that the metadata in my images can be read wherever I send it, which, in practical terms means that Photoshop can read it. I only use three image formats, JPEG for ordinary images; LZW compressed TIFF for images with transparent backgrounds and PSD files for layered images.
It strikes me that you are using PNG files, about which I know not a lot apart from it's ability to handle transparency easily.
Have you tried experimenting with different image formats? I have no idea if it might help.
All I know is that using Opus to write image metadata is smooth,very, very quick and extremely reliable. What's more you can do it all without leaving the best file browser there is.