NOTE: Issue reported to AAC issues, as well.

I am running a ServerTutorialPlus tutorial in creative mode that transports the player to distant unloaded chunks, after a block click at each point. Without AAC protections, it works fine. The AAC configuration is nearly-default; differences:
Transport to the first point works correctly and quickly.

hitbox.max_reach: 14.1
speed.enabled: false
noswing.enabled: false
log_file: false
aackick_broadcast: false

En route to the second point, Minecraft reports:

[11:11:18 WARN]: playerName moved too quickly! -4446.7,0.0,6839.0

but after a significant delay, the player manages to get there. [NOTES: The real player name has been replaced above with playerName, to protect the guilty. The test player has OP permissions.]

En route to the third point, again after significant delay, the player loses connection to the server, and the server crashes.

Crash report attached. 

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There was no Minecraft crash-report.