'%_Old%' won't find what you intend it to find. The underscore means "any character". The literal value needs to be '%[_]Old%'.

Given that you have dbatools installed, there is an easier way to include parameters:

Invoke-DbaQuery -SqlInstance localhost -Database AdventureWorks2017 -Query "[dbo].[uspGetBillOfMaterials]"   
 -CommandType StoredProcedure -SqlParameter @{StartProductID...

Given that SQL Server is expensive and licensed by the CPU core, why would you waste CPU on running the SQL Server Agent?

I prefer to have a second computer that...