Delete key not working on Mac

Describe the bug I am not able to delete a wrong annotation in Mac using Chrome.

To Reproduce Steps to reproduce the behavior:

1. Go to imglab.ml/#. Open an image
2. Click on Polygon. Try to make an annotation. And then try to delete it.
3. It fails

Screenshots

Even after pressing delete key multiple times, it is not working.

Console Errors

None

Device detail (please complete the following information):

• OS: [e.g. Ubuntu] Mac
• Browser [e.g. chrome, firefox] Chrome

Additional context

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