Predator and CL did not provide any possible suspects.
Using Code Search for the file, "EditingUtilities.cpp" assigning to the concern owner.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/07359e3b41086b15af2bf433a28f1a4d8b31ff9b

@chongz -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 450818:452941.

Detailed report: https://clusterfuzz.com/testcase?key=4626923612536832

Fuzzer: inferno_layout_test_unmodified
Job Type: windows_asan_chrome_no_sandbox
Platform Id: windows

Crash Type: UNKNOWN READ
Crash Address: 0x00000010
Crash State:
  blink::hasEditableStyle
  blink::CompositeEditCommand::insertNodeBefore
  blink::InsertTextCommand::insertTab
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=448237:448270
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome_no_sandbox&range=450818:452941

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv97qWyPEtPEIfxq5iZb5iaOCuwQhPTq6rp5VX4NIzYPlBcrHr1uZFgk3HpRrCswiwap4Xy5zpxQSTzo_q1AA0Zd1d5rv1p6nha0Bwm3JPte9aoMXtdv-pnBkRnDJVhm7f2ZHnz_0lgm-xHFKENQrhDHUUIf0pY1S8YwTUi0yi6xlksavKAsx43i0splUVUu_5D_6ougQw87g-4hgkuY_gXPwmpGEfzf2i0D9oYgF2aIl90djIlQRXsa7v2977Uh6EIEoDTKzimWHkCXpECeSW63CfS-q21y4AoNPQCEIQcelVXI2oqwtSZKGvK4DeB-0f0eTuo9jO8Lp4cBinq62t7Z0OifC67j04FB0DguAVx0FDUOtWZyFsxcRaeM94dwNMo3ZxEYr6NVaMrmtEnIPWVM1EScrFA?testcase_id=4626923612536832


Additional requirements: Requires Gestures

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.