User not upgraded after purchasing a subscription with stripe ( Race condition )

[K a M a L]

Today I got a report that a user has paid a recurring subscription via stripe but his account was not upgraded .. checking his payment log entry it shows
Error: Event data received from Stripe does not contain the expected values. and Purchase request key was N/A.
Checking the database I found that Purchase Request provider_metadata has the correct subscription_id and everything looks fine there.
Going through the code to find a probable reason for the issue I figured out it...

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User not upgraded after purchasing a subscription with stripe ( Race condition )

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