Predator and CL could not provide any possible suspects.
Using Code Search for the file, "editingstrategy.cpp" assigning to concern owner who might be related.

@yosin -- 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 495550:495592.

Detailed report: https://clusterfuzz.com/testcase?key=4563615851216896

Fuzzer: inferno_twister
Job Type: windows_syzyasan_chrome
Platform Id: windows

Crash Type: Null-dereference
Crash Address: 0x00000003
Crash State:
  blink::EditingIgnoresContent
  blink::InsertParagraphSeparatorCommand::DoApply
  blink::CompositeEditCommand::ApplyCommandToComposite
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=416628:417590
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=495550:495592

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4563615851216896

See https://github.com/google/clusterfuzz-tools for more information.

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

ClusterFuzz testcase 4563615851216896 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.