Error: Object reference not set to an instance of an object error. when loading a custom package spec

Load package spec that contains a RemoveCLRAction in XML, it throws object reference not set to an instance of an object error.
This error will not occur when using page designer to complete this update, instead of Load package spec. 

Steps to Duplicate

1. Create a CLR action and add it to a page spec
2. Attempt to remove the CLR action using an alter page action

Environment

 Blackbaud Infinity SDK
 4.0
 4.0.141.19

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