[Bugsy]

If I understand correctly ... the easiest way would be to check point-contents of the players origin when the no-clip expires.

Here's a little demo; add noclip onto yourself and then say /start in chat and then move in and out of boxes, walls, underground, and high in the sky outside of the maps upper boundary.

PHP Code:

#include <amxmodx>
#include <fakemeta>

#define PLUGIN "Check if Stuck"
#define VERSION "1.0"
#define AUTHOR "bugsy"

public plugin_init() 
{
    register_plugin( PLUGIN , VERSION , AUTHOR );
    register_clcmd( "say /start" , "DoStart" );
}

public DoStart( id )
{
    set_task( 0.5 , "Stuck" , id , _ ,_, "b" );
}

public Stuck( id )
{
    static Float: fOrigin[ 3 ];
    pev( id , pev_origin , fOrigin );
    
    if ( engfunc( EngFunc_PointContents , fOrigin ) == CONTENTS_SOLID )
        client_print( id , print_chat , "Stuck in object" );
    else
        client_print( id , print_chat , "Can move freely" );
}