Warning "old Variatons" Still Appears

We are still getting this warning:

"Your store still has old product variations. They currently appear as separate products, without the ability to switch between them. To make them work as before the upgrade, convert old variations to new variations. It's easy and automatic."

It links to a page with products that still have the old variations type, but there are none left. I wonder how i can get rid of the warning?

Any suggestions where i can find this in the database?

Looks like none faced such issue. Please contact support team