Downloading an image with the little button next to filename sometimes saves two copies, one corrupted

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Step 1: Save the image with this button, which keeps the original filename. It looks fine when you're saving it, but...

It sometimes saves like this. I can't figure out what makes this happen, sometimes it saves just fine. I can delete these two files, try saving this same file again, and it saves without any issue.
This also happens with the "Download Link: Add a download with original filename link to the menu." menu setting.