The prior repro steps did not take mods into account, as it would appear this issue only occurs with modded items added to the entity spawner.
Requirements:
TMT - Turkish Forces
and my map mod, please note this mod was made for the purposes of this repro and is just the Malden 2035(its dependency) used as a scenario with Zeus added to it (Zeus game mode, empty zeus entity set to player, zeus game mode set to allow unofficial addons, interface forced)