CBQ quits when HZ=1000

I have a reasonably simple setup that shapes traffic to/from one address
on a bridge. When HZ=100, everything works great. When HZ=1000, CBQ
stops all traffic to this address forever as soon as throughput hits the
CBQ limit, 1Mbit in this case. See attached rules. Has anyone else
observed similar behavior?

The kernel is 2.4.22 on an SC1100 (x86).
PSCHED_CLOCK_SOURCE==PSCHED_JIFFIES

rtg
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