I had my MacBook at the local Apple Store just recently for a couple of days and they checked it through (after wiping and resetting it). They returned it to me and said there is no hardware and/or software problem with the device. So according to them it must be either a) a problem of some software that I have installed or b) a problem with some external hardware. If it's not reproducible without any external hardware connected or 3rd party software installed they will always claim that it's not "their fault". What is strange in my case is that I've never had this one panic before (but other ones, that's why I brought it to the Apple Store - and spent countless hours trying all kind of other things before), but this error ("element modified after free") now happens after I got it back from the Apple Store, when I plug in a specific external USB-C hub with one or two monitors connected. It looks like it happens more often if I connect it right after waking the MacBook up from sleep.
klemensz
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2019 MBP16 with AMD Radeon Pro 5500M 8 GB + Hagibis USB-C Hub with 1x DP and 2x HDMI