Why can't I T4 aisling these?

Been told by chat that it's because of the damage while leeching mod. Have crafted other items with multiple "veiled" mods. I don't see why in this case, aisling cannot annul the multimod or prefix cant change craft and give me a veiled suffix.

Is this intended or a bug?

If I remove crafts and re-craft multimod, pref cant be changed and a random prefix then Aisling it, can I then recraft the damage while leeching mod? Doesn't make much sense if it works like that.

unknown if intended or not but it is definitely the damage while leeching craft, make sure to craft something not from unveiling if you intend to Aisling Slam(in this case life or %armour is a safe and cheap one).

you swap to the veiled mod you want to block when doing the unveiling or just w/e you want to use.

I would assume it's because your veiled mod is crafted, and veiled mods are no longer crafted.