Hello Jim,
Template FieldService_WorkOrderV2 is also listed as a Method template. I had a glitch on my account. Sorry about that, I'll try to assist you with this.
On the Print work order button, under preference, in step 2, click edit generate report you would want to ensure the filter report is set for where [Table]Activity, [Field]RecordID is [Condition Statement]equal to Value [From] Session, Current Screen Active Record ID. This filter information probably got modified when you pointed to a new report.
If that doesn't fix it then please tell me what you modified on that report? And what if any changes you made to the button that calls the report.