As mentioned by cpbmd, it’s due to the loosening or even disappeared tiny locking screw of the deployant clasp. I have experienced it before. Should be able to fix it immediately at Patek service center (that’s my case in ~ 2018)

May 03, 2021,13:13 PM
 

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Deployant issue

 
 By: benzng : May 3rd, 2021-01:07
It seems something wrong with my deployant clasp. The bar sticking out. Can i fix this? Or do i need to bring to AD? Thanks for the suggestion ...  

It's most likely a totally trivial issue, but if your manual abilities are as amazing as mine....then don't touch it any further and just hand it to your AD tomorrow! ;-))

 
 By: FabR : May 3rd, 2021-01:53
The important thing is, of course, *not* to strap the watch on your wrist until the clasp is fully functional again ;-) Cheers.

There is a Tiny screw that is used to keep the bar in place.

 
 By: Costa (aka Connie) : May 3rd, 2021-02:05
The screw must have fallen out. It is about the size of a grain of rice.

thank you everyone for your reply

 
 By: benzng : May 3rd, 2021-21:57
now I understand the situation better. I am missing a small screw that will fix this issue. appreciate it. many thanks