V# generates incorrect test: an attempt to use Object instead of specific type

[gsvgit]

• Test to reproduce
• Steps to reproduce
  • Remove this attribute
  • Run the test
  • Compile generated tests
  • Get a number of erros KnapsackBagTests.cs(23, 21): [CS1061] 'object' does not contain a definition for 'Calculate' and no accessible extension method 'Calculate' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)