When importing images with harvest_template.py, there are often various placeholder images. Bot shouldn't import them
https://commons.wikimedia.org/wiki/Category:Image_placeholders
Usually there are few images in one group of articles, so parameter -ignore:file:placeholder.svg,file:placeholder2.svg should help.
Better is to check, if bot checks image categories for these strings:
placeholders, 'SVG flags of missing', ' Replace this image', 'Fully transparent images' ..
Version: core-(2.0)
Severity: major