1.21.1-2.1.3

🐛 Fix

• Fixed a rare race condition where ModWhitelist could try to send scan results after the client had already disconnected
• Prevented a NullPointerException when a background scan completed after the connection had already been closed

🔧 Improvement

• Added connection checks before sending scan response chunks
• Remaining scan results are now discarded safely if the client disconnects during the response process