You are probably looking for a change made after 597608 (known good), but no later than 597654 (first known bad).
CHANGELOG URL:
  https://chromium.googlesource.com/chromium/src/+log/7d1d4a4719a085b946a29f7dc0937d6894ccdc5c..c8d0d44728928704030f8a901174d649f164cbe5

Mike:

You did https://skia-review.googlesource.com/c/skia/+/160460 which changed shapes, which is the most interesting change in the bisection range. Could this be you?

I accidentally filed this with my Google account. This is not secret.

The changed referenced in #5 is just an internal test, it does not affect any clients of Skia.

Thanks.

Possibilities:
https://chromium.googlesource.com/chromium/src/+/53c1dd90160fe939c9e3bb7690a0bb9f806caaf3

 Issue 894179  has been merged into this issue.

Confirmed comment 8 with a local build.

Malay: Your change https://chromium-review.googlesource.com/c/chromium/src/+/1262967 breaks submenu arrows. It does not cleanly revert.

Please fix this.

This was fixed this morning.