TZUTC: -0800
MSGID: 59039.sync_sys@1:103/705 2da27540
PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
TID: SBBSecho 3.32-Linux master/6bb344da2 Dec 08 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
open https://gitlab.synchro.net/main/sbbs/-/issues/1029

If the same Attack packet is delivered multiple times, The Clans will parse it
multiple times, which generates multiple Attack Result packets, which can not
only perform the attack multiple times, but also has multiple armies return. 
This trivially leads to large numbers of followers and high rewards.

IBBS processing should use a small sliding window on "next" packet allowance,
and absolutely not allow the same packet to be processed multiple times in a
row.
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