Demon form cooldown bug with second wind & ingenuity

Experience:

Build able to maintain permanent uptime with second wind only, but *not* with both second wind and ingenuity.

Expected behaviour:

Reducing cooldown further should be favourable for a build that wants to maintain permanent uptime, not the other way around.

Actual behaviour:

It appears to me, and I could be wrong, that a charge is expended when shifting out of the form, and then the whole skill goes on cooldown from 0, when both support gems are slotted; however, this doesn't happen with second wind only; as such, there is an unexpected breakpoint.

Suggested fix:

I honestly don't know what could be causing this.

Issue priority suggestion: somewhat low as this is not really a problem for builds looking to maximize uptime (since they probably can easily exceed the number of seconds in form required for a charge to be generated in the background)