Kangaxx issue [Baldur's Gate II: Enhanced Edition]

After completing all possible side-quests in Chapter 2, including slaying the three liches required to assemble the mighty Kangaxx, I went to his lair and managed to kill his lich form, however his demilich form proved to be more than I could handle, so I left the crypt area.
After a quicksave I re-entered only to see Kangaxx in his demilich form. Upon entering again, there he was.
I deceided to leave him be and return after gaining a few levels, in the end I went on with the game and finally returned to his lair in Chapter 6, however he is gone.
I've tried everything, resting, coming after dark.
If anyone had the same issue, any and all help would be much appreciated.
After a quicksave I re-entered only to see Kangaxx in his demilich form. Upon entering again, there he was.
I deceided to leave him be and return after gaining a few levels, in the end I went on with the game and finally returned to his lair in Chapter 6, however he is gone.
I've tried everything, resting, coming after dark.
If anyone had the same issue, any and all help would be much appreciated.
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C:CreateCreature("HLDEMI");
But yeah, I would probably crutch my ol tomb-dusted butt on out after a while as well, so can't blame him TBH.
Tagging @CamDawg here since he probably knows better.
Outside of enrage getting its listed stun protection, no immunities get added or removed; Minsc's berserk and barbarian rage have never protected from imprisonment. I suspect this is another one of those "Boots of Speed added haste" things that many players believe even though they've never been true.
The player really only has a few methods to block imprisonment, especially since it's not subject to normal MR: enrage, Otiluke's Resilient Sphere, Avoid Death HLA, an item that blocks level 9 spells such as the Protection from Magic scroll and IIRC Spell Trap. By the time you're getting HLAs and Spell Trap, you probably have better ways of dealing with demi-liches (spike traps, huzzah), leaving the (limited) protection scroll or the purely defensive ORS. Enrage is probably the most useful option here, if you have it and don't want to burn a protection scroll.
Edit: though I suppose that is not a specific block to the imprisonment effect itself, just the spells that tend to inflict it.
And though it's also not an immunity to imprisonment itself, another common tactic against demiliches is to use a Protection from Undead scroll, as it makes you invisible to them.
When I played 2y ago it hit as +4 (basically every weapon that hit as +x against some kind of enemy had the enchantment level of the highest bonus) and I remember myself claiming that because of this, Daystar was arguably the best longsword in SoA (seeing that it hit as +4 and gave additional damage against evil and double against undead (both of which are prevalent in SoA).
When I decided to return to the game later this month (about a week ago), I launched DLTCEP and wow, it has +2 enchantment level again. RIP.
I suspect that some kind of update that also removed pulsing light from weapons like Carsomyr and Daystar is to blame here.
Have just checked in the NearInfinity, for the game version 2.3.67.
It has the following Effect 1 (in addition to general Enchantment of 2):
Type: Enchantment vs. creature type (344)
Target: Self (1)
Power: 0
IDS value: MASK_EVIL - 3
IDS target: ALIGNMEN.IDS (8)
Timing mode: Instant/While equipped - 2
Dispel/Resistance: Natural/Nonmagical (0)