The cursor bug refers to the mistake in sparksuit animation rendering, where the motion of the mouse on the screen was captured in the suit animation. During live streaming of crate opening (April 14, 2024), Robert and Peggy explained that the animation rendering for each clan suits were done by different teams and that this mistake was made by the team in charge of Emerald Hand SS. It was not caught during the review process and unknown until some of the owners started noticing on their SS after the minting and revealing was done.
This "bug" is claimed to be unintentional and the team noted that they are not planning on fixing it. Rather, it would remain as type of easter egg on the existing affected SS animations.
HOW TO FIND IT: There is not easy way of finding the cursor bug. You will need to open the SS page from Mavis Market link to show the animation and watch it (carefully) to see if it exists. The cursor location/movement/duration all vary for each SS animation that is affected by it. So the only way to discover it is to check the entire video in entirety carefully.
RARITY: This is strictly a visual rarity. As such, any valuation of the affected suits are fully dependent on the demand of those who may desire to own one. It is NOT a feature or trait. It will not affect the suit's utility at all.
Example: You can see a tiny cursor at the bottom center of the animation.