It must've been a while then since we've seen something like this? Idk how they're going to get their arms back. Maybe this sets up for Sakura to do something..
I've had a lingering suspicion about that. Since Naruto has been sketched with a replacement arm in The Last, unlike Sasuke whose left side has been mostly concealed, it begs the question of when and how he attained it. Could it be that his bijuu chakra regenerated it for him? There has been some speculation that Kurama might have sculpted a prosthesis out of chakra for him, but he admitted in this chapter that he would be going to "sleep" after giving up the final remainder of his power. The healing process would have been completed almost immediately after first sustaining the injury. It's hours since then.
What if Sakura was forced into making a decision like the one in the OVA? She has only just enough chakra to help restore one limb, and as a testament to the love she has for Naruto taking precedence over anything else, including Sasuke, she chooses him? This could be the lasting mark of the decision she has to make soon.