SWGoH bug report - Republic Protection invulnerability - Sifu

I've just managed to record a quick example of this bug, having had it happen a few too many times in the last few weeks. Usually it's JKA or Ahsoka it procs on but this time it was Sarge.
In a nutshell, the buff should prevent the target from being 'defeated during the first enemy attack (including assists) that would otherwise defeat this ship. When reduced to 1% Health, gain Stealth and Protection Up (50%) for 2 turns and recover 25% Health. Then, this buff expires.'
What's happening is that the 'reduced to 1% health' status effects aren't triggering, so the target remains completely impervious until the buff expires.
Annoying...