A save demonstrating the issue where some instruments during a performance are simulated despite being hauled, and are dropped with a stuck activity reference, and in_job flag at the end of the performance.

This save occurs just before 2 dancers, 5 instrumentalists go to perform. interesting things to note:

• 4 instrumentalists have the specified instrument (1 is furniture, 3 are hauled), 1 is simulating
• 2 of them are "playing" instrument, the other 3 are "simulating" instrument (despite 2 of them hauling one)
• once the dance is complete, the 2 units that were simulating despite hauling, drop the instrument at their feet, which ends up permanently stuck with the in_job flag, and a reference to the activity that no longer exists

This might be related to #9485 in which people observe a similar behavior occuring when there are not enough dancers, however in my save scenario there are enough dancers, musicians, and instruments to complete the performance. The code to "use" an instrument is failing in some cases, resulting in the instrument getting "stuck" as no logic is called to remove the activity reference or unset the in_job flag.