Unfortunately, PayPal's front-line customer service agents don't seem informed about technical issues reported to PayPal MTS, nor trained to handle any technical issues in general at all, and by all accounts their training seems to prioritize quick answers over correct or helpful ones.
As mentioned above here, we have reported this issue to PayPal MTS along with proof documenting the issue could only be occurring at their end, and they have confirmed that they are aware of and working to resolve the problem at their end.