Many Afghan frontier troops crossed the border to take refuge on the Pakistani side. Some officers also seek refuge due to continuous attacks by the Taliban in Afghanistan.

Al-Jazeera has published the exact statement by the Pakistan army:
"An army statement says 46 members of Afghan forces, including five officers, cross border near the Pakistani town of Chitral in Khyber Pakhtunkhwa province."

The Pakistani army has entertained Afghan forces and provided meals, safety, and required medical care as per military standards.
The Afghan government denied accepting the news of troops passing into Pakistan. In retaliation, the Pakistan army has released a video of soldiers.

ISPR@bbcpashto
video of 46 Afg soldiers including 5 officers who have been returned to Afghan govt authorities at Nawapass Bajaur today at 0035 PST

These Soldiers from the Afghan National Army and Border Police were given safe passage into Pakistan, on their own request, pic.twitter.com/jtVnLRfzLm

— Sumaira Khan (@sumrkhan1) July 26, 2021

This issue is not true. No Afghan military personnel has taken refuge in Pakistan, said General Ajmal Omer Shinwari, a spokesman for the Afghan National Defense and Security Forces, Al-Jazeera has written.
Pakistan returned the Afghan Fighters to authorities after one day refuge, who Passed the Border amid Taliban Attacks in Afghanistan.
"The soldiers have now been amicably returned to Afghan authorities on their request along with their weapons and equipment," the voanews said.