The tube pins are typically a soft metal.
Not a hardened steel.
Where did it break?
Flush with the glass?
I have seen pins bent over flat with the glass & they could be pulled back straight.
Obviously this stretches the metal at the bend.
Being a soft metal it can be flexed to a degree.
Could be a metallurgy thing.
Then again if it is a stainless type steel, being harder it may crack.