iFixit has disassembled the iPad mini 6 and has explained why some people perceive the jelly scrolling effect when using the tablet. Unsurprisingly, Apple's latest tablet is difficult to repair, as is the case with current and past iPads.
https://www.notebookcheck.net/iFixit-explains-why-the-iPad-mini-6-suffers-from-jelly-scrolling.568461.0.html