MSP430FR5739: Timer A0 Interrupt Issue

Tool/software:

Hello,

I misinterpreted the meaning of Timer0_A0/A1 and have adjusted my question apropriately.

I would like some help figuring out why Timer0_A1 ISR is triggering indefinitely when using P1.2 as TA0CLK input supplied from external hardware. Despite this, Timer0_A0 and the Timer0_A0 ISR appear to be functioning correctly.

The main project code has been simplified, all macros and definitions removed as it's not relevant to the question:

#include "cs.h"
#include "msp430fr5739.h"

void delay_ms(uint16_t _value){ //basic delay function
	for (int i = _value; i >= 0; i--){
		__delay_cycles(((double)1000000.0 / (double)1000.0));
	}
}

volatile uint8_t counter_A0 = 0;
volatile uint8_t counter_A1 = 0;

float test(uint16_t sample_time){
	P4OUT |= (BIT0); //turn oscillations on (external circuit, connected to P1.2)
	delay_ms(5); //let settle

	__bis_SR_register(GIE);

	TA0CTL = (TASSEL__TACLK | MC__CONTINUOUS | TACLR | TAIE | CNTL__16);
	delay_ms(sample_time);
	TA0CTL = (TASSEL__TACLK | MC__STOP); //this line is never reached

	__bic_SR_register(GIE);

	P4OUT &= ~ (BIT0);//turn oscillations off

	uint32_t pulses = (65536 * counter_A1) + TA0R;

	return(pulses * (1000.0 / (float)sample_time));
}

void main(void){
	WDTCTL = WDTPW | WDTHOLD;   //stop watchdog timer
	__bic_SR_register(GIE);
	
	P4DIR |= (BIT0); //initiate extrnal control pin
	P1DIR &= ~(BIT2); //initiate P1.2 as TA0CLK
	P1SEL0 &= ~(BIT2);
	P1SEL1 |= (BIT2);

	float count_out = test(100);
	//do something with count_out

	__bis_SR_register(LPM0_bits + GIE); //enable global interrupts and enter LPM0
}

#pragma vector = TIMER0_A0_VECTOR
__interrupt void timerA0_ISR(void){
	counter_A0++; //incriment counter (working as intended)
}

#pragma vector = TIMER0_A1_VECTOR
__interrupt void timerA1_ISR(void){
	counter_A1++; //shouldn't be called? (never clears)
}

Can someone explain why both Timer0 (TA0) vectors are being triggered?