Issue with 'worth of coupons used'

Hi,

I have an issue with ‘worth of coupons used’ in Reports section. When I use report ‘Sales by date’- I found after some research that this value is trimmed for some reason if it is more than 999, i.e. 9800 will show only 9. I found that i can add some code from class-wc-report-coupon-usage.php and it works correctly. But it is not good for future updates.
So what should i do with this issue?

Many thanks!

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