Unable to reproduce the issue on reported chrome version #70.0.3538.77 and latest chrome #72.0.3598.0 using Mac OS 10.14 by following below steps.

Steps:
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1.Launched chrome.
2.Navigated to "https://portal.aws.amazon.com/billing/signup#/start".
3.Placed the cursor at the end.
4.Tried backspacing until it reached "#', observed that editing works normally and the text gets deleted.

Attached screencast for reference.
@reporter: Could you please retry the issue by creating a new person without any apps and extensions in it, reset all flags to default and let us know if still exists.
Thanks.!

Deleted: 900936.mp4 1.4 MB

	900936.mp4 1.4 MB View Download

This definitely depends on the exact state of the omnibox completions and will not work on a fresh profile.

I got it to repro on mail.google.com, I think.

I can try omnibox-intervals if that would help.

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

In fact, it is even more path-dependent than I realized.

- If I *paste* `https://console.aws.amazon.com/dynamodb/home?region=us-east-1#tables:`, I can then backspace (or option+backspace) over it just fine.

- If I *type* `con` then press the right arrow key, then it gets stuck.

[Mac triage] Thanks for the report. This looks like a known issue which is going to be fixed in an upcoming update.