This bug still happens in v1.4.0.36.
Here is a big Ifrit – https://prnt.sc/u0yuoj
Here is he dead and another smaller after him = unkillable bugged medium ifrit. – https://prnt.sc/u0yw1i
Here is Killed medium ifrit and small one = unkillable bugged small ifrit. – https://prnt.sc/u0ywwt
Here is this battle again, but without this bugs – https://prnt.sc/u0yyi8
https://prnt.sc/u0yzih
But the Gunners stood for half the battle with knives in hand and skipped turns after the neighboring little Ifrit were defeated.
"Death is a part of mercenaries job."