The wiki doesn't have any report of Nacua leaving practice early with an injury — nothing in the Rams or Puka Nacua pages mentions a training-camp incident like that.
What the wiki does flag is a broader injury concern around him: the Rams' team page notes "Nacua injury vulnerability" in early-2026 commentary, and his contract-extension talks are reportedly complicated by his injury history, with the Rams hesitant to commit to a $150–200M deal partly because of it (from the Puka Nacua page). Calvin Johnson's record-chase endorsement also came with the caveat "if he stays healthy."
So if you saw a report about him leaving practice early, it's not in the wiki yet — but given his existing injury-risk profile, it's worth keeping an eye on. He remains the consensus top-5 pick / WR1-2 in 2026 rankings as of the latest updates.