A11y: VoiceOver says "uncheck checkbox" when you check a checkbox using VO-Space #16197

I'm submitting a ...

• bug report
• feature request
• other (Please do not submit support requests here (see above))

Current behavior:
VoiceOver says "uncheck checkbox" the first time you check a checkbox using VO-Space. This only happens if the checkbox has an ng-model attribute.

Expected / new behavior:
The first time you check a checkbox using VO-Space, VoiceOver should say "check checkbox." This is what happens in Safari.

Minimal reproduction of the problem with instructions:
CodePen demo and instructions

AngularJS version: 1.6.4, 1.6.6, snapshot

Browser: Chrome 60 macOS 10.12.6

Anything else:

In my full web app, VoiceOver consistently says the opposite of what it should, even after checking/unchecking multiple times. For some reason in the CodePen it only says it wrong the first time I interact with a checkbox, and it corrects itself after that.

Also, this might be related to a Chromium bug report.