Cannot give discount on Fixed Product Tax (WEEE)

[kassner]

Preconditions

1. Magento 2.4.1, fresh install; reproducible on 2.4-develop
2. PHP 7.4.3 (Ubuntu 20.04 LTS);

Steps to reproduce

1. Enable the Fixed Product Tax module;

2. Create the FPT and associate it to the default attribute set;

3. Create a product with the FPT configured:

4. Go to the frontend, add the product to the cart and assert that the tax is being charged (make sure to select the right country);

5. Go back to the admin and create a 100% discount coupon code:

(Off screen: Free Shipping: For shipments with matching items).

6. Enable the Free shipping delivery method:

7. Go back to the frontend, to the cart, and apply your coupon;

8. Verify that the order still has $0.99 left to be paid;

9. Go to the checkout billing page to make sure the rule is still applicable:

Expected result

1. Order grand total $0.00;
2. Have a toggle in the cart rule form that allows the rule to be applied on top of the WEEE/FPT;

Actual result

1. WEEE/FPT is charged regardless of cart rules;
2. No way to control if WEEE/FPT should be charged regardless of the cart rule;

Additional info from Engcom

Also reproducible if Fixed amount discount for whole cart is set in Cart Price Rule Actions

Rechecked with a simple Tax Rule. The Coupon discount is applied for the whole Cart, including the Tax
The discount is not applied only for FPT

[m2-assistant]

Hi @kassner. Thank you for your report.
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[kassner]

The Include FPT In Subtotal = Yes configuration yields the same result.

[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[engcom-Bravo]

Hello @kassner

Thank you for your report

We Confirm that the issue is reproducible on the latest 2.4-develop.
Additional info from Engcom is added to the Description