[Issue] Sales rule CartFixed calculation : incorrect discount amount about magento2 HOT 15 OPEN

Hi @Nuranto. Thank you for your report.
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Hi @engcom-Dash. Thank you for working on this issue.
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Hi @engcom-Delta. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
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@magento give me 2.4-develop instance

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Hi @engcom-Dash. Thank you for your request. I'm working on Magento instance for you.

from magento2.

Hi @engcom-Dash, here is your Magento Instance: https://2763b33e65d4d0ac59042530bf393f86.instances-prod.magento-community.engineering
Admin access: https://2763b33e65d4d0ac59042530bf393f86.instances-prod.magento-community.engineering/admin_9966
Login: 49e06943
Password: a9af8f53016c

from magento2.

@magento give me 2.4-develop instance

from magento2.

Hi @engcom-Dash. Thank you for your request. I'm working on Magento instance for you.

from magento2.

Hi @engcom-Dash, here is your Magento Instance: https://2763b33e65d4d0ac59042530bf393f86.instances-prod.magento-community.engineering
Admin access: https://2763b33e65d4d0ac59042530bf393f86.instances-prod.magento-community.engineering/admin_fd99
Login: 6b3c2240
Password: dfa2d4f121d5

from magento2.

Hi @Nuranto

Thanks for reporting and collaboration.

Verified the issue on magento 2.4 dev instance and 2.4.7 instance and the issue is reproducible.

We are seeing a Discount difference of 16€, the amount changes when cart items change.

Steps to reproduce

1. Create a sales rule "test1", without coupon, cart fixed amount = 5€ (Discard subsequent rules = no)
2. Create a sales rule "test2", without coupon, cart fixed amount = 10€ (Discard subsequent rules = no)
3. Create a sales rule "test3", with coupon 'test3', cart fixed amount = 1€ (Discard subsequent rules = no)
4. Create a frontend cart, with total amount > 20€
5. Add coupon test3

Please refer the attached screenshots.

Discount amount after applying coupon code test3:

When cart amount/products are changed :

Cart rules Configuration:

from magento2.

✅ Jira issue https://jira.corp.adobe.com/browse/AC-11914 is successfully created for this GitHub issue.

from magento2.

✅ Confirmed by @engcom-Dash. Thank you for verifying the issue.
Issue Available: @engcom-Dash, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

from magento2.

I don't know the exact place where the issue appeared but I found that the cart totals calculation was called twice.
Also I found that in M2.4.6-p4 all worked fine and totals calculation called only once.

from magento2.

Looks like these commits introduced break changes
4ffcb02
c741823

from magento2.

I can confirm this issue. We ran into this while running functional tests with the Magento 2.4.7 upgrade. Previous version (2.6.4-p4) did succeed the same tests.

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