Sierra not in my purchase

[P1LGRIM]

Today I looked at my purchases on my MacBookPro which has not had Sierra installed (still on El Capitan) :

 

[Algos]

Seems like it is intended not to show in purchases:

"macOS Sierra doesn't appear in the Purchased tab. Use the Search field to find it again, then download it from the product page."

https://support.apple.com/en-gb/HT202161

 

[sgt-bauer-fr]

I have made virtual machine with Yosemite and, yes Sierra is appeared in the purchase.