At the problematic instance, check at the showconfig what are subscribing to the "packageinstall:items:ended" pipeline event - also it's good to compare if you have anything here not at the good instance.

Is anything is at the broken instance not at the good one, try removing this first and retest.

At the problematic instance, check at the showconfig what are subscribing to the "packageinstall:items:ended" pipeline event - also it's good to compare if you have anything here not at the good instance.

If there's anything at the broken instance not at the good one, try removing this first and retest.