The number of the fibers flagged "BLACKSPOT" increased in the run 18

Recently it was reported that there were fibers flagged "BLACKSPOT" in the science field where there is no fiber moved behind the dot on purpose (cf. INSTRM-2381). Being asked, I checked the number of the fibers whose status was "BLACKSPOT" from the early May 2024 run (run 16).

It seems that the number of such fibers increased (became non-zero) in the August/September 2024 run (run 18). There are 93 cases in total, and the there seems three reasons (and/or combinations of them):

1. The fibers are indeed behind the dot. There are many cases where fibers didn't move out of the dot in the next iteration.  -> chyan , do you have any idea about it?
2. The fibers identification failed. This happens when the fiber is close to another fiber. -> karr , could you please check? (could you see the attached slide?)
3. The registered dot position looks different (Probably I should check it.) Also, the updated target position looks very close to the dot. The expected shift by updating the coordinate should be small enough but we should check it.-> Kiyoto Yabe which file is used for the dot position just in case?