children_count can become negative after deleting categories

[wojtekn]

Preconditions

1. Install clean Magento 2.3.4

Steps to reproduce

1. Log in into admin backend

2. Navigate to Catalog -> Categories

3. Click "Add Subcategory"

4. Fill category name with "Parent 1", Save

5. Click "Add Subcategory"

6. Fill category name with "Child 1", Save

7. Click "Add Subcategory"

8. Fill category name with "Child 2", Save

9. Click "Add Subcategory"

10. Fill category name with "Child 3", Save. At this point this category should have level = 5
    

11. Click on "Child 1" category

12. Delete category

Expected result

1. Categories are deleted and children_count for remaining categories are valid eg. catalog_category_entity look as follows:

1    3    0    2020-02-05 18:38:54    2020-04-24 10:50:38    1    0    0    2
2    3    1    2020-02-05 18:38:54    2020-04-24 10:50:38    1/2    1    1    1
15    3    2    2020-04-24 10:49:35    2020-04-24 10:50:38    1/2/15    1    2    0

Actual result

1. Categories are deleted but children_count for remaining categories are negative - catalog_category_entity look as follows:

1    3    0    2020-02-05 18:38:54    2020-04-24 10:50:38    1    0    0    -1
2    3    1    2020-02-05 18:38:54    2020-04-24 10:50:38    1/2    1    1    -2
15    3    2    2020-04-24 10:49:35    2020-04-24 10:50:38    1/2/15    1    2    -3

[m2-assistant]

Hi @wojtekn. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

For more details, please, review the Magento Contributor Assistant documentation.

@wojtekn do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

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

The issue is reproducible on a fresh 2.4-develop instance.

Actual Result:

Categories are deleted but children_count for remaining categories are negative

[magento-engcom-team]

✅ Confirmed by @engcom-Alfa
Thank you for verifying the issue. Based on the provided information internal tickets MC-33835 were created

Issue Available: @engcom-Alfa, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.