I'm aware that Taiko's scoring is increased during Kiai, and finishing the spinner gives you additional score which is affected by Kiai.
The problem is that if the spinner starts before, and then ends after non-Kiai <-> Kiai timing changes (given that the Kiai timing is in-between the spinner start and end, not at exactly either ends of it), there will be scoring inconsistencies depending on when you have completed the spinner.
Example: DJ Contacreast - Wondering [Easy] by xxheroxx (ranked map)
Spinner starts at 1:06.857 and ends at 1:08.571, while Kiai Time changes is at 1:08.464. If you complete the spinners between 1:06.857 and 1.08.464, you'll get lesser score (due to it being non-Kiai-Time) compared to completing the spinner between 1:08.464 and 1:08.571 (which is during Kiai Time). You can check on both my Replay Data: 127,140 score and 127,280 score.
osu! version: 20141015.1 (latest)
The problem is that if the spinner starts before, and then ends after non-Kiai <-> Kiai timing changes (given that the Kiai timing is in-between the spinner start and end, not at exactly either ends of it), there will be scoring inconsistencies depending on when you have completed the spinner.
Example: DJ Contacreast - Wondering [Easy] by xxheroxx (ranked map)
Spinner starts at 1:06.857 and ends at 1:08.571, while Kiai Time changes is at 1:08.464. If you complete the spinners between 1:06.857 and 1.08.464, you'll get lesser score (due to it being non-Kiai-Time) compared to completing the spinner between 1:08.464 and 1:08.571 (which is during Kiai Time). You can check on both my Replay Data: 127,140 score and 127,280 score.
osu! version: 20141015.1 (latest)