2.2.6 CE Buying the last of a simple product does not clean parent configurable product cache

[AndrewPenry]

When a user purchases the last of a simple product, even though the quantity is reduced to zero, the option is not disabled until the cache is manually flushed.

Preconditions (*)

1. Magento 2.2.6
2. PHP 7.0
3. All default options. Manage Stock is ON.

Steps to reproduce (*)

1. Create a new product (TEST). Give it a price and weight. Create 2 Configurable Options for color (RED and BLUE). Give them both a quantity of 1.
2. Visit the product page (test.html). Select the RED option and Add to Cart.
3. Proceed with a successful checkout.
4. Visit the product page (test.html). Attempt to select the RED option.

Expected result (*)

1. You should not be able to select RED, because the quantity of "TEST-RED" is 0 and the status is "out-of-stock"

Actual result (*)

1. You can select RED and click Add to Cart. When you do, you get the "You need to choose options for your item." message.
2. Manually flushing the cache (or casuing it to be flushed by saving the product) will remove the RED option.

[magento-engcom-team]

Hi @AndrewPenry. 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-engcom-team give me $VERSION instance

where $VERSION is version tags (starting from 2.2.0+) or develop branches (for example: 2.3-develop).
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@AndrewPenry do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[AndrewPenry]

Hi @AndrewPenry. 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

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

• yes

I suspect this is related to #18999

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-96150, MAGETWO-96151 were created

[subbu1993]

@magento-engcom-team give me 2.2.6 instance