On playhorizon (frames drawn on the CPU, control requests answered slowly)
world_reopen read the minecarts before the mineshaft's last one arrived (3
then 4 on every reopen), and the sculk walk polled the sensor with separate
requests that missed its 30-tick active window. The minecart list is read
once it stops changing; both clients sample the sensor every tick from one
ctl script, alongside the walk.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>