Adding a new Parameter to any snippet breaks the snippet in all prior workflows

If I run the original workflow with the updated money management, that new parameter is run with NaN or null. Instead of the default parameter value.



I have quick fixed this before, using the - + on the parameter for each existing workflow to populate the snippet with the default value. But, something underlying isn't working as this shouldn't need to be done.
i.e it displays correctly the default value ("1" in my case). But, underlying when the code is run, it must execute as NaN or null. Which causes no trades on all my strategies.