I am also seeing exactly same thing. Not sure if this is hardware issue/software issue ..or what. Here is crash report, seeing every time laptop goes to sleep. I have thinkvision monitor connected via USB C cable to macbook pro 16" 2019. ====== panic(cpu 10 caller 0xffffff8013c9f846): [kext.kalloc.2048]: element modified after free (off:1672, val:0xfffffffe00000000, sz:2048, ptr:0xffffff9372fb4000, prot:zero)  1672: 0xfffffffe00000000 Backtrace (CPU 10), Frame : Return Address 0xffffffb0db5aacf0 : 0xffffff801348e0dd 0xffffffb0db5aad40 : 0xffffff80135d4f33 0xffffffb0db5aad80 : 0xffffff80135c552a 0xffffffb0db5aadd0 : 0xffffff8013432a2f 0xffffffb0db5aadf0 : 0xffffff801348d8fd 0xffffffb0db5aaf10 : 0xffffff801348dbf3 0xffffffb0db5aaf80 : 0xffffff8013c9d81a 0xffffffb0db5aaff0 : 0xffffff8013c9f846 0xffffffb0db5ab470 : 0xffffff80134ecad6 0xffffffb0db5ab4e0 : 0xffffff801349d6bc 0xffffffb0db5ab530 : 0xffffff8013bae4f2 0xffffffb0db5ab550 : 0xffffff7fad8f8fce 0xffffffb0db5ab600 : 0xffffff7fad8f965e 0xffffffb0db5ab640 : 0xffffff7fad8b9d86 0xffffffb0db5ab660 : 0xffffff7fae1f3e78 0xffffffb0db5ab900 : 0xffffff7fad8ba924 0xffffffb0db5ab930 : 0xffffff7fae1f5074 0xffffffb0db5ab9c0 : 0xffffff7fae1f30f7 0xffffffb0db5aba10 : 0xffffff7fae1f2ee7 0xffffffb0db5aba60 : 0xffffff7fae1f1f99 0xffffffb0db5abaa0 : 0xffffff8013c1e13e 0xffffffb0db5abaf0 : 0xffffff7fad8ba5e2 0xffffffb0db5abb20 : 0xffffff8013c2837b 0xffffffb0db5abc80 : 0xffffff8013580961 0xffffffb0db5abd90 : 0xffffff801349375d 0xffffffb0db5abe00 : 0xffffff8013469cf5 0xffffffb0db5abe60 : 0xffffff8013481312 0xffffffb0db5abef0 : 0xffffff80135a982d 0xffffffb0db5abfa0 : 0xffffff8013433216       Kernel Extensions in backtrace:          com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fae1ae000->0xffffff7fae218fff             dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[366C7BD4-9502-3D1C-ABBE-DE9749913D0C]@0xffffff8014ac0000->0xffffff8014ad5fff             dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fae32f000->0xffffff7fae35dfff             dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8015f6a000->0xffffff8015f92fff             dependency: com.apple.iokit.IOReportFamily(47)[367CCAE7-DAB4-3424-B191-44044619D5CB]@0xffffff8015fa1000->0xffffff8015fa3fff             dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8016094000->0xffffff80160b0fff          com.apple.driver.AppleIntelKBLGraphics(16.0.4)[F7BCF586-AF08-3277-9C66-04F439E684B4]@0xffffff7fad8a3000->0xffffff7fad95afff             dependency: com.apple.iokit.IOAcceleratorFamily2(442.9)[BDA1401D-563F-3650-B616-C8073E90475B]@0xffffff7fae1ae000->0xffffff7fae218fff             dependency: com.apple.iokit.IOGraphicsFamily(585.1)[2C81B74F-C771-3643-82EC-12CD4AC5EFDB]@0xffffff7fae32f000->0xffffff7fae35dfff             dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff8015f6a000->0xffffff8015f92fff             dependency: com.apple.iokit.IOSurface(290.8.1)[8FA218E4-361C-3C8B-94F0-48434AA535A0]@0xffffff8016094000->0xffffff80160b0fff   Process name corresponding to current thread: WindowServer Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev   Mac OS version: 20F71