Item Sale Price Difference Not Converted

Hello.

We are running latest WordPress/Woo/Plugin version and in our shop we have several items on sale.
The issue is, when secondary currency is used, sale price deduction is still displayed in primary currency.
Example:
When primary currency is used Item A cost is $349.
It is on sale and now costs $309 so the difference is $40.

When we use secondary currency, HK Dollar, Item A costs 2,739 HKD.
Sale price is 2,425 HKD but the sale difference still shows $40 instead of 314 HKD.

Can you help us figure this issue out?

Thank you.