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Calculated Object Properties not updated when other properties of object updated

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Twine 2.0.11, Sugarcube 2

Hi, new here, have been using Twine 2.0 desktop version for almost a month now.
Recently came across a tutorial for object oriented programming for Twine and followed a couple more online resources to update my Twine code.

I am having a problem with "non-updating" properties. Consider the following code in my "StoryInit" passage:
<<set $crystal to {
	red: 0,
	yellow: 0,
	white: 0,
	black: 0,
	green: 0,
	get total(){return this.red +this.yellow +this.white +this.black +this.green;},
}>>

And then I do some changes to the total properties in other passages.
<<set $crystal.green+=1>>

My problem is the $crystal.total still remains zero rather than "auto-calculated" with new values in red, yellow, etc.

Thanks in advance for your help.

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