Lost parameter value during SQL trace in EF Core

I have implemented an approach for tracing SQL queries from EF Core according to this article: https://docs.microsoft.com/en-us/ef/core/miscellaneous/logging. And have problems with tracing query parameters. When I receive Log events in all values of DbParameterLogData I see only the question mark instead of the actual values which I passed to the query.

I am using VS 2015.