I'm finding that the "Cannot Be Disabled" listing on a TEC Flagship's Purge Systems is not functional.

Basically jumped into a grav well with a fleet containing a disabler-capital ship (Advent w/Reverie I think).  I noticed that the opponent fleet had a slight adventaged and decided to bounce, so I click Purge to prevent the disable from stopping the jump out.

"Ability has been disbaled" ... ok, maybe I need to engage it before the disabler hits?

Wait for disabler to pass, manually reissue phase jump out command, try to click purge system ahead of time.  Nothing happens.  The cooldown timer doesn't start, and while the button does show me clicking on it, nothing happens, flagship keeps getting disabled.