I'll need to get it logged but it looks like NetSuite introduced a bug in the past few weeks in relation to project creation via templates in suitescript. This was working just fine until recently. If you create a Project in the UI from a template, it creates the project and you can see the "The tasks are generating" message on the tasks sublist. If you create a Project in suitescript and assign a template, on record.save() it will error out and not return a record ID saying that its under construction which means that tasks are being edited but in reality, i just need the project ID back. The project is still created even though that exception is thrown though. If you don't specify a template at all, the project will create without any errors.