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Concurrent checkouts can lead to negative stock #6363
When two customers check out concurrently for the same product and the total quantity being ordered is greater than the quantity available, the stock can become negative.
Steps to reproduce
We have reproduced this behavior on a single machine, by performing the above steps by simulating one customer in one browser window and another customer in a second browser window.
This solution https://belvg.com/blog/magento-2-oversell-fix.html are working for us