Ranged attack timer reset bug

[Tecmos Deception]

I noticed today (on green) that my little rogue runs into problems when using shurikens to skill up throwing. 15 rogue, no item or spell haste, plain vendor shurikens.

With summoned mage daggers, I never had the problem. But with shurikens, the ranged attack button regularly is available too fast. Clicking ranged attack even a short delay after the button appears to be ready results in messages like:

Error: Timer not up. Attack 0, ranged 147


I assume 147 is 147 milliseconds more time. However after getting this issue, the button remains depressed for a few seconds. I've seen delays of more than 900 ms reported by the game even though my ranged attack button appeared to be ready. I'm guessing something is causing the game to think shurikens have a 10 lower delay than they actually do or something?