I was having the "element modified after free" kernel panic issue on my 16 inch MBP running 11.6 when connecting to a Dell monitor via usb-c cable which is also the power cable. After having gone through this thread here is a list of things that helped few users. Thanks to one of the posts here, turning off MST has resolved my issue on 11.6 itself. Update OS to 12.x use DisplayPort 1.1 (instead of the default 1.2) on monitor, menu -> Display -> DP 1.2 -> Disable On the monitor, turn off MST which is only needed to daisy chain monitors Switch from USB c to HDMI for display Use different USB c cable or Apple multiport adapter