The iPad mini 6 may have an issue with the way the display updates when scrolling. One half of the display appears to update faster than the other. Colloquially, this is called the "jelly" effect.
The iPad mini 6 introduced an updated display to the compact tablet design, but it still has some teething issues. Upon closer inspection, there appears to be a limited "jelly scrolling" issue with the tablet. As The Verge's Dieter Bohn reports on Twitter, the left and right sides of the screen don't update in sync when the device is used in portrait mode. The effect, which has occasionally occurred on devices in the past, is particularly noticeable in situations like pages of text or when large patterns move up and down across the entire screen.
iPad mini 6: A hardware or software problem?
A video was published, which shows the phenomenon when scrolling a web page, with the right side updating a hair before the left. However, the video is in slow motion to illustrate the effect for demonstration purposes. According to Bohn, the effect is barely noticeable, but occurs "every now and then". Additionally, the issue does not occur when the iPad mini is used in landscape mode, but only in portrait mode. While it's plausible that this could be a hardware issue with the display panel itself, it's also possible that Apple is developing a software-side fix for a future iPadOS update. Since Apple itself has not commented on the matter, we can only speculate at this point.