[gabuch2]

Originally Posted by KliPPy You will change it only for a single call (AddToFullPack), it won't affect any other code. Collision is not processed in AddToFullPack so it won't matter for collision. At least give it a try and see the results for yourself, it may work.

You were right, now it renders the players, however, every time I pass through one of them I get a small "bump", cancelling my speed. Probably because I changed the groupinfo in the pre hook.

Final Code

public semiclip_pre(ent_state,e,edict_t_ent,edict_t_host,hostflags,player,pSet) 
{   
    if(player)
    {
        g_iGroupInfoBuffer[edict_t_ent] = pev(edict_t_ent, pev_groupinfo);
        set_pev(edict_t_ent, pev_groupinfo, pev(edict_t_host, pev_groupinfo));
    }
    
    return FMRES_IGNORED;
}

public semiclip_post(ent_state,e,edict_t_ent,edict_t_host,hostflags,player,pSet) 
{   
    if(player)
    {
        if(pev(edict_t_host, pev_groundentity) == edict_t_ent)
            set_es(ent_state, ES_Solid, 1);
        else
            set_es(ent_state, ES_Solid, 0);

        set_pev(edict_t_ent, pev_groupinfo, g_iGroupInfoBuffer[edict_t_ent]);
    }
    
    return FMRES_IGNORED;
}

I guess it's enough for now as a workaround, I don't know if that's fixable.

Thank you.