Images like this remind me of incredible machine game. Yukkuri are place near objects with no context other then the result. Normal behavior is kick out the window in favor of the artist preference. Not that that holds any relevance, with yukkuri being a parody of a meme of a computer game that that most of the canon information is fan made.
This is totally within standard established yukkuri behavior. Just tell them you have sweet sweets and they'll usually gobble it up without hesitation. This is completely within context of yukkuri behavior and not just artist preference.
Yukkuris are fanmade and this behavior, like aozf said, is within the usual established boundaries. You are welcome to your own opinions, but just don't expect too many people to agree with you unless you create your own material.