[Static2601]

This should work for you. I had to do it by a command since OnMapStart, im guessing, its removed before you spawn, I also tryed OnPluginStart and same thing. You also don't need to SetEntityModel if you have min and max bounds defined and vice versa.

#define Duck "models/workshop/player/items/pyro/eotl_ducky/eotl_bonus_duck.mdl"

#include <sourcemod>
#include <tf2>
#include <sdktools>
#include <sdkhooks>
#include <morecolors>
#include <halflife>

public Plugin:myinfo =
{
    name = "Spawn Manager",
    description = "",
    author = "Matt",
    version = "1.0",
    url = "http://www.sourcemod.net/"
};
public OnPluginStart()
{
    RegConsoleCmd("sm_hurt", Command_Hurt);
}
public OnMapStart()
{
    PrecacheModel(Duck);
}
public Action:Command_Hurt(client, args)
{
    new entity = CreateEntityByName("trigger_hurt");
    if(entity != -1)
    {
        DispatchKeyValue(entity, "spawnflags", "1");
        DispatchKeyValue(entity, "damage", "99999");
        DispatchKeyValue(entity, "damagecap", "99999");
        DispatchKeyValue(entity, "damagetype", "0");
        
        DispatchSpawn(entity);
        ActivateEntity(entity);
        
        new Float:origin[3]
        origin[0] = 343.0
        origin[1] = -182.0
        origin[2] = 65.0
        TeleportEntity(entity, origin, NULL_VECTOR, NULL_VECTOR); // Teleport trigger_multiple to desired location
        
        SetEntityModel(entity, Duck);
        
        new Float:minbounds[3] = {-100.0, -100.0, 0.0};
        new Float:maxbounds[3] = {100.0, 100.0, 200.0};
        SetEntPropVector(entity, Prop_Send, "m_vecMins", minbounds); // Set the size of the trigger
        SetEntPropVector(entity, Prop_Send, "m_vecMaxs", maxbounds);
        
        //SetEntProp(entity, Prop_Send, "m_nSolidType", 2);
       // SetEntProp(entity, Prop_Send, "m_fEffects", GetEntProp(entity, Prop_Send, "m_fEffects") | 32);
        
        SetEntProp(entity, Prop_Send, "m_nSolidType", 2);

        new enteffects = GetEntProp(entity, Prop_Send, "m_fEffects");
        enteffects |= 32;
        SetEntProp(entity, Prop_Send, "m_fEffects", enteffects); 
        
        //SDKHook(entity, SDKHook_StartTouch, Hook_StartTouch);
        //SDKHook(entity, SDKHook_EndTouch, Hook_EndTouch);
       // SDKHook(entity, SDKHook_Touch, Hook_Touch);
    }
    return Plugin_Handled;
}