[4.4.9.2] "Purchases" are duplicated from one "Invoice"

[Jipa331]

Hello,

I noticed this issue recently.
From 1~2 months ago, when customer paid for One "Invoice", commerce system makes Two "Purchases" sometimes.
Due to this, License Key delivery system (a.k.a plugin SULK) is delivering key two times.
I already contacted to the SULK Plugin developer, and he said this duplicated "Purchase" issue is coming from IPS system itself.
How can I fix this issue?
Is it well known bug?

Thanks.

(For the below case, invoice number #236521 makes two purchases, #117457 and #117458),

[Daniel F]

We have fixed a bug in 4.6 which resulted in duplicate purchases, but the fix isn't retroactive. 

 

Quote

- Fixed race-condition potentially causing duplicate purchase records or transactions.