On every EU order when the buyer has tax and have a shipping promo equal to the shipping price, tax is shown in the report but it is not actually charged.
For this order for example:
item price: 6.66
item tax : 1.33
shipping price: 0.93
shipping tax: 0.19 (which was not actually charged ! but yet it appears in the report)
shipping promotion: -0.93
If you combine all those numbers you get a higher price than what the buyer actually paid . either shipping tax should be zero or shipping promotion should include tax.
I guess when the buyer doesn’t pay for shipping he doesn’t need to pay the shipping ta but on other cases shipping promotion doesn’t have to be equal to the shipping price and on such cases shipping tax will be completely wrong