Confidence is big with these juniors. What shoulder injury did Papa sustain and when? Is it something serious? Papa played a full summer schedule so the injury is probably gone by now.
I don't know the full detail, but he withdrew from his 2nd round match at International Spring Championships ITF and later pulled out of the Easter Bowl citing shoulder injury. It is probably not serious since he played the full summer schedule like you said, but it may have affected his serve. Hopefully, he can defend his points here and get some confidence going.