Find it did not provide any possible suspects.
Assigning to the concern owner from the CL --
https://chromium.googlesource.com/chromium/src/+log/da07d58a5d041395d3d6317ab3aef31c0087285e..4141f530d2d03c42cba3fb5c0949fd33fff0f36f?pretty=fuller

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/d814290cfc839f8e7d02b632e33026c8878a1b3d

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

Cannot reproduce on Win7 Canary 58.0.3015.0. msrchandra@ Can you help verify if the issue still exists?

Also, the commit is a revert of my previous CL, which shouldn't cause any change.

 Issue 693480  has been merged into this issue.

Actually it appears that this issue requires additional clusterfuzz setup to reproduce. 
msrchandra@ Can you help doing a narrow bisect?

--
Also +xiaochengh@ to see if this is related to  issue 693008 .

Not relevant to  issue 693008 , which is about mixed editability.

ClusterFuzz testcase 4626923612536832 is verified as fixed, so closing issue.

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

ClusterFuzz has detected this issue as fixed in range 452175:452475.

Detailed report: https://clusterfuzz.com/testcase?key=6407826131124224

Fuzzer: bj_broddelwerk
Job Type: windows_syzyasan_chrome
Platform Id: windows

Crash Type: UNKNOWN
Crash Address: 0x00000013
Crash State:
  blink::hasEditableStyle
  blink::CompositeEditCommand::insertNodeBefore
  blink::InsertTextCommand::insertTab
  
Memory Tool: SYZYASAN

Regressed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=443594:443650
Fixed: https://clusterfuzz.com/revisions?job=windows_syzyasan_chrome&range=452175:452475

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv95ITtNsCjPsYDshNYR21x1IB9mp8AGbf_0sF2HSjlzwglYSmFwxsyFfFCS68E06CzA1JW77bRzn3LKLAugloKJeVvV5KnjP2wwpMBRgJ-sV8ShBz0gBZiRZ6IYW1rRUvycPlIFRsSuhdRVOyoxwetc5UDfIcHNDI68GrhXEnifrtJb9_8BfuhNH-HXyumD11z1fhpbwo7qMCgrhx9sPPy8Zc-v3KSJ1t4uAKxDCjsMtNTR3VcTLOXQQP7q8X6EeiwwGPz91iXg9-E87xDMVTRRcamAPjro1xQikiqPTnRqj0tWX2OOJAOWzQOxd0dsQBBshFH0oqpZaliMP8NE1nNb5PJoSVedgSXljjpM_SQUHvZC5elY?testcase_id=6407826131124224


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.