Product stock status change does not purge product varnish cache

[zakdma]

Preconditions and environment

• Magento version is the latest 2.4.7-p2
• Varnish is used as FPC
• Indexers are in UPDATE BY SCHEDULE mode
• Cron is running

Steps to reproduce

1. Logon into admin panel
2. Go to Stores>Configuration>Catalog>Inventory. Open the Stock Options dropdown. Set Yes in the Display Out of Stock Products option
3. Create a simple product with a stock quantity (id = 1, SKU = simple1)
4. Please note: Varnish cache should be enabled
5. Go to System > Extensions > Integrations
6. Add new integration.
7. Below the General section enter Name, Email (optional), and Password.
8. In the left menu, click API.
9. From the Resource Access drop-down menu, select All.
10. Click Save
11. On the Integrations page, next to the newly created integration, click Activate.
12. On the Integration page, you can find the list of the resources, click Allow.
13. The Integration Token Details are generated.
14. Copy and save Access Token to use it further
15. Click Done.
16. Go to Stores > Configuration > Services > OAuth > Consumer Settings > Allow OAuth Access Tokens to be used as standalone Bearer tokens option to Yes. Save configuration.
17. Open the product on the front and see it's in stock
18. Use any REST client and run the request

curl -X PUT "https://<magento-host>/rest/V1/products/simple1/stockItems/1" -H "Authorization: Bearer <access-token>" -H "Content-Type:application/json" --globoff -k --data-binary @- << EOF
{
  "stock_item": {
    "qty": 55.0,
    "is_in_stock": false
  }
}
EOF

19. Refresh the front product page.

Expected result

Product became "Out of Stock" on the front page

Actual result

Product is still "In Stock" on the front page

Additional information

The problem is that Stock indexer does not reset FPC for product (tag: cat_p_) when reindexed
See stock indexer implementation
https://github.com/magento/magento2/blame/2.4-develop/app/code/Magento/CatalogInventory/Model/Indexer/Stock.php#L84
and compare it with the Price indexer
https://github.com/magento/magento2/blob/2.4-develop/app/code/Magento/Catalog/Model/Indexer/Product/Price.php#L96

Release note

No response

Triage and priority

• 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 @zakdma. Thank you for your report.
To speed up processing of this issue, make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, Add a comment to the issue:

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[andrewbess]

Hello @zakdma
Thank you for your contribution
Great catch
Could you please provide the fix
Thank you in advance.

[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
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[engcom-Delta]

Hi @zakdma ,

Thanks for your reporting and collaboration.
We have verified the issue in latest 2.4-develop instance and the issue is reproducible.
Kindly refer the screenshots.

Steps to Reproduce
1.Go to Stores>Configuration>Catalog>Inventory. Open the Stock Options dropdown. Set Yes in the Display Out of Stock Products option

2. Enable Varnish Cache

3. Create a simple product with a stock quantity (id = 1, SKU = simple1)

4. Go to System > Extensions > Integrations
5. Add new integration.
6. Below the General section enter Name, Email (optional), and Password.
7. In the left menu, click API.
8. From the Resource Access drop-down menu, select All.
9. Click Save
10. On the Integrations page, next to the newly created integration, click Activate.
11. On the Integration page, you can find the list of the resources, click Allow.
12. The Integration Token Details are generated.
13. Copy and save Access Token to use it further
14. Click Done.
15.Go to Stores > Configuration > Services > OAuth > Consumer Settings > Allow OAuth Access Tokens to be used as standalone Bearer tokens option to Yes. Save configuration.
16.Open the product on the front and see it's in stock

17. Use any REST client and run the request

18. Refresh the front product page. Observe product is still in stock.

Thanks.