Attribute visuals (shields) bug

[Garkin]

Did you notice that Unit Attrribute Visualizer for shields doesn't work correctly?

You can easily reproduce this bug if you renew two or more shields multiple times - old shields aren't crrectly removed, so your health bar looks like you have permanently applied shield. (Tested with Blazing Shield I + Healing Ward III)

If you take a look into values in PLAYER_ATTRIBUTE_BARS.attributeVisualizer.visualModules, shield value never gets to zero, there are artificial numbers like:
lastValue = 52151
maxValue = -15213
statusMax = 8114 (probably correct)
statusValue = 8114 (probably correct)
value = 52151

I have tried to track shield strength on my own (ShieldInfo addon), but it seems that this is not an UI bug, because event EVENT_UNIT_ATTRIBUTE_VISUAL_UPDATED returns invalid numbers. And also because of invalid shield value events EVENT_UNIT_ATTRIBUTE_VISUAL_ADDED and EVENT_UNIT_ATTRIBUTE_VISUAL_REMOVED are almost never fired (for ATTRIBUTE_VISUAL_POWER_SHIELDING).

Is it really game bug or did I miss something?