The Pods Framework is a Content Development Framework for WordPress - It lets you create and extend content types that can be used for any project. Add fields of various types we've built in, or add your own with custom inputs, you have total control.
Even if $force is set to 'true' the image won't be generated if it doesn't exist already. Accord to Scott Clark this commit might be the culprit.
https://github.com/pods-framework/pods/commit/279915623a227b3755f85ed015733d352025075a