Unless a plan's written QDRO procedures provide otherwise (which many do*, although they should not unless they like trouble), the plan conducts business as usual unless the plan (including an agent of the plan) receives a domestic relations order -- not hears about one, smells one, or infers one. If a terminated participant is entitled to a distribution, then a distribution should be processed in accordance with usual plan procedures.
If the Standing Order has been delivered to the plan, then the plan should follow its procedures for processing a domestic relations order (we know it does not meet the requirements). This is the same approach as can be taken with the travesty California Joinder Orders. The plan has a reasonable time to determine whether or not the standing Order is qualified, and will not make a distribution pending its decision. Who knows what a reasonable time is, exactly? With any luck, a "real" domestic relations order that want to be a QDRO will be received within a reasonable time and then things are back to normal. If not, then the QDRO fiduciary (probably PA) will have to take appropriate action on the Standing Order, which will involve allowing a reasonable time for that action to be appealed by the aggrieved person and no distribution will be made pending the decision on appeal.
The circumstances are complicated because a plan fiduciary is a party to the divorce and presumably has knowledge or receipt of the Standing Order?. Is that receipt by the plan? I would prefer not to argue that it is not receipt by the plan.
Forget about the rollover, analytically. Rollover is merely something that can happen to certain distributions. It is only a distraction in this matter.
I agree with Larry Starr that this should be overseen by the plan administrator, even if the plan administrator is clueless and reliant on the TPA for everything (which is why TPAs get out of their lane too often). Be careful who you choose as advisers.
*Misguided by incorrect informal Department of Labor guidance about the law.