PIN Schematics + ADC10 , possible bug?

Hi, as you can see in the schematic, the Schmitt Trigger is disabled when INCHx = y or ADC10AE0:

And when the schmitt trigger is disabled, we can expect that the entry in red does not influence the PxIN.

I made a program to test this, is as follows:

#include "msp430g2452.h"

RSEG CSTACK ; Define stack segment
RSEG CODE ; Assemble to Flash memory
;-------------------------------------------------------------------------------
RESET mov.w #SFE(CSTACK),SP ; Initialize stackpointer
StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT

SetupP1
; Selecionando Ax
; bis.w #0x0100, &ADC10CTL1 ; INCHx = 1

; Configuracao das portas
bis.b #0x08, &P2DIR ; P2.3 output

; Configuracao da função da porta
;bis.b #01h,&ADC10AE0 ; P1.0 ADC enable

bis.w #0x0010, &ADC10CTL0 ; ativando o ON
bis.w #ENC+ADC10SC,&ADC10CTL0 ; Start sampling/conversion

Mainloop

jmp Mainloop ;
;-------------------------------------------------------------------------------
COMMON INTVEC ; Interrupt Vectors
;-------------------------------------------------------------------------------
ORG RESET_VECTOR ; POR, ext. Reset
DW RESET
END

The schematics follows:

I made a video for test: https://vimeo.com/49796805

1-First step check that the Schmitt Trigger is actually enabled. Surprise!

2-Second step, I uncomment the line ---> bis.b # 01h, & ADC10AE0 <--- and then the Schmitt trigger is disabled.

3-Third step, showing that INCHx not need to be selected properly.

This is a bug? According to the schematic, the INCHx should disable Schmitt Trigger (have initial value 0). Why did this not happen?