Weapon becomes slower if attackspeed cap is reached via temp buffs

I have a rogue with a 1.8 weapon equiped. Via combat talents “Lightning Refelxes” my Weapon has attack speed of 1.64. And with Slice n Dice I reach the 1,3 attack speed cap.

After SnD falls off my weapon now has an attack speed of 1.82.

A swing timer also shows that this is not a display bug.