Custom Property Values Not Updated at Project level in Linux

I created a project that reads values from project level custom properties.  A groovy script runs to read them and update them.  When I run a Load Test in Windows 10 which only has 2 threads and 3 runs per thread, it runs correctly and updates the property values at the project level.  However if I take the same project and copy it to a linux environment, it is unable to update the property values.  I've looked at permssions and I am not seeing any errors that it can't update the property values.  Does anyone have an idea on what could cause it to not update in linux?