When removing a Simple Product from a Grouped Product, the first product is moved near the end of the list

[densen45]

Preconditions (*)

1. Magento 2.4.2-p2

Steps to reproduce (*)

1. Create a Grouped Product and add at least four Simple Products
2. Save the Grouped Product
3. Edit the Grouped Product and remove one of the Simple Products (not the first one at position 0)

Expected result (*)

1. The Simple Product is removed
2. The order of the other products doesn't change

Actual result (*)

1. The Simple Product is removed
2. The first product at position 0 is moved near the end of the list (the actual position depends on how many Simple Products you have added to the Grouped Product before)

---

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @densen45. Thank you for your report.
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[densen45]

@magento give me 2.4-develop instance

[magento-deployment-service]

Hi @densen45. Thank you for your request. I'm working on Magento instance for you.

[magento-deployment-service]

Hi @densen45, here is your Magento Instance: https://e06ddb0a15cae1d01ed3d2c9e25abad5-2-4-develop.instances.magento-community.engineering
Admin access: https://e06ddb0a15cae1d01ed3d2c9e25abad5-2-4-develop.instances.magento-community.engineering/admin_0ebd
Login: f5bf8c3a
Password: f907177ba4d5

[densen45]

I was able to reproduce this issue on the provided vanilla Magento instance.

[densen45]

This issue is caused in the dynamic-rows.js in the function _updateData at lines 955 ff.

magento2/app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows.js

Lines 955 to 958 in f3e8f25

	if (!rec.position) {
	rec.position = this.maxPosition;
	this.setMaxPosition();
	}

After saving the Grouped Product the first Simple Product gets the position 0 (before saving the position is 1). When removing a Simple Product the _updateData function is called. In the above code snippet the rec.position returns 0 which is treated as false in the if statement. Then the position of the first product is set to the max position.
That is wrong. The 0 shouldn't treated as false in this case.

[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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