I used to use it in early versions but starting from version X (I don't remember the numbers), I removed all conditional branches including slotOnCooldown to reduce the complexity of the plugin further. Then, when people asked to put them back, I put them back but didn't test them again. I'll test it again now and will tell you the result later. Don't forget to join the Discord and send a message there so I can tag you when the result is ready.