Pasting an image into pleromafe from xclip uploads the image AND pastes the text representation (Firefox)

After placing an image into the clipboard with the command xclip -selection clipboard -t image/png -i "image.png" and pasting it into pleromafe on Firefox the clipboard is uploaded as an image, and pasted as text:

This issue does not occur in mastofe on Chrome or Firefox, pleromafe on Chrome, or when copying an image from within Firefox itself