According to the module code, you should also ensure "timer_procs" modparam is set to 0 (default):

/* Register cache timer */
if(ul_timer_procs<=0)
{
    if (timer_interval > 0)
        register_timer(ul_core_timer, 0, timer_interval);
}
else
    register_sync_timers(ul_timer_procs);

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