Attack Speed Bug with Non-Hero Units

https://imgur.com/a/bkAgq2Z

Linked above is the results of some testing I have done, on hearing about the strange interaction between Witch Doctor's death ward and Chen's Penitence. The results are fascinating.

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For starters, it would seem that Ward units (Venomancer, Shadow Shaman, Witch Doctor wards) receive a percentage increase to their attack speed when attacking units with Penitence, rather than a flat 120 buff as expected. This percentage increase is actually GREATER than 120%. Go figure.

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Over the course of this investigation, however, something more concering was discovered: it would seem that currently, the game gives all non-hero units attack speed using a percentage increase rather than a flat increase. The most drastic case of this is displayed in the images linked above: a visage bird that normally has 450 attack speed, when affected by a Drow Aura meant to give +300 attack speed, gets its AS increased to 1,700, which is... a 400% increase, rather than 300 like you might expect. Go figure.

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Below, find a summary of units found to be affected by this bug:

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Ward units that are affected by the Penitence bug:

Mass Serpent Wards

Plague Wards

Death Ward

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Non-hero units affected by the overall attack speed bug (not necessarily complete) :

Helm creeps

Warlock Golems

Visage Familiars

Beastmaster Boar

Lycan Wolves

Lane Creeps (See album)

Brewmaster Split Units

Necronomicon Units

Towers

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As a final note, the Spirit Bear seems to also be affected by this bug, but has an attack speed cap of 952. Go figure.