Document Version Calculated Column problem in Document Library

I´ve added a calculated column (Name: CalculatedVersion) in SharePoint Online (Spanish) using this formula:

=Versión

When browsing to default Document Library View i see that CalculatedVersion value is ok.

When adding a new Document, CalculatedVersion value is 0.

To correct this problem the workaround i´ve found is go to the CalculatedVersion column edit form, and reaccept the formula.

Now the value is correct.

I´ve tried changing version field name from "versión" to "version" with no luck.

This is the formula value from SharePoint Designer, =_UIVersionString . It´s ok!!!

Any ideas? When other fields are used, this problem does not occur. Best regards.