DPS Tooltip for Dual Wield with Weapon Alternation

Hello great dreamers!

Your DPS is huge, but sadly off by a factor of ~1.5.

As far as I can tell, all ingame dps tooltips for skills that alternate weapons are incorrect when dual wielding melee weapons. Currently tested with heavy strike, frost blades, molten strike and the default attack.
Sunder works fine so it is related to weapon Alternation.

Experiment can be easily reproduced with a lvl 1 no passives character of any class. Dual wielding 2 identical weapons should increase default attack dps by a factor of 1.32
(aps x 1.1 x pdmg x 1.2), yet results are around factor 2. This bug is not limited to identical weapons.
Actual damage numbers and attack Speed are shown correctly, only the dps number is wrong.

Currently there is no indication this bug effects anything mechanically.