[Duplicate] Discounts not working

Continuing the discussion from Reduction issues in 1.4.0:

I just tried to use the Invoice discount feature, but the feature has a bug. If I add a discount to a invoice item, the invoice item total reflects the discount entered, but the invoice subtotal and total are NOT updated to reflect the discount Also if I enter an invoice discount (£/GBP or %age), the total is NOT updated to reflect the discount.

Thanks

David

Examples:

Same here.
The demo has this behaviour too.

Already discussed in Discounts only with Invoice Tax
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