In 2018, the Bubsy series fandom Amino was visited by a user named "Beelzebubsy" alleging to have unreleased concept art drawn by Ken Macklin for Bubsy's design in Bubsy in Claws Encounters of the Furred Kind. Bubsy fans immediately noticed that one design - a female Bubsy that was scrapped for being "too sexualized" - bore a close resemblance to "Modern Bubsy", a fan-made interpretation of the character as a depressed transgender prostitute created by SqrlyJack, an artist who hates Bubsy and gained notoriety for being malicious towards Bubsy fans. This connection was further drawn by the presence of another alleged prototypical design inspired by Michael Jackson, who SqrlyJack is known to be a fan of, and his jacket used in the music video to Jackson's song "Beat It", as well as a later post by the same user showing a screenshot of a Bubsy parody from one of her RPG Maker games. The third concept art does have a strong resemblance to a real piece of Bubsy concept art shown in a 1990s magazine, suggesting it may have been traced.

If one observes the hoax concept art closely, they can see that the attempt at replicating Macklin's signature does not completely match up with his real signature, such as having a lowercase a with a double-edged side instead of one, and a lowercase k without a sloped bottom, adding to the already strong suspicion that the concept art was faked.

Another Bubsy fandom member, Xindictive, who was on a Bubsy Discord server with late Bubsy creator Michael Berlyn, has said on occasion that both Berlyn and a former friend of SqrlyJack have confirmed the images to be faked for a fact. However, since the Discord server where these communications presumably took place has been closed as a result of hacking, it is hard to access these direct confirmations.