What the heck, Preview?

Occasionally, Preview gets persnickety about saving changes to images:

Turning on streaming of log messages in Console, I finally got some details on it:

Text from that:

*** ERROR: copyImageSource:1942: image destination UTType does not match image source UTType

Other people seem to be complaining about a similar Preview issue here as well: https://discussions.apple.com/thread/255194116?sortBy=rank. From that discussion, it sounds like certain images trigger the behavior.

Hovering over “ImageIO” in the log shows “/System/Applications/Preview.app/Contents/ MacOS/Preview (/System/Library/Frameworks/ImagelO.framework/Versions/A/lmagelO)”… location from which the error is arising?

Maybe some related docs here: https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/ImageIOGuide/imageio_basics/ikpg_basics.html.

This looks promising as I think about building a replacement for my narrow needs: https://commons.apache.org/proper/commons-imaging/index.html.