function undo() not work!!

[connor-tan]

Search before asking

• [x] I have searched the PolygonZone issues and found no similar bug report.

Bug

undo method is not working! the "points" variable always empty!

Environment

Chrome

Steps to Reproduce

No response

Additional Information

No response

Are you willing to submit a PR?

• [ ] Yes I'd like to help by submitting a PR!