A new detection has been implemented as part of the Exploits check. It was named "Packet Overflow" and aims to prevent irregular packet spam, which may ultimately even crash a server. You must be using ProtocolLib to enable this detection.
Logs:
Corrected several NoSwing spam false positives.
Corrected a few Hack-Prevention handler console errors.
Corrected several KillAura yaw-rate false positives.
Corrected several possible KillAura pitch-rate false positives.
Asynchronous-detections option was brought back to false by default.
Possibly corrected a NoSwing console error.
Greatly improved the Chunk & Thread utilities.
Prevented the memory from overflowing unnecessarily.
Improved the Location synchronisation handler.
Recovered the functionality of the Plugin-Ticks handler.
Corrected several movement boat false positives.
Corrected an issue where ProtocolLib handlers wouldn't enable.
ProtocolLib handlers are now destroyed when the plugin is disabled.
Corrected several Speed hop-illegal false positives.
Corrected several compatibility errors in 1.7 servers.
Corrected several Jesus walking-abnormal false positives.