Custom Death Messages do not work in 2023.2 (And damage type MOB_ATTACK is quite useless)

It seems with the newest build of Mcreator, Custom Death Messages using custom damage types no longer have the ability to carry over a victim's name in the death message, instead leaving a %1$s where the name should be. Also, MOB_ATTACK as a damage type is useless without the ability to attribute either the victims name or the attacker's name to the damage type. I assume this is a blunder on MCreator's part, as I have done what I needed to do in order to get the message to function, it just does not grab the victims name at all.