No, that's a classic misconception. People claimed that windows "flowed" because really old ones were thicker at the bottom, but that was just how some old window glass was made.
I think the basis of the claim is that glass doesn't have the same kind of phase transition that a crystalline solid would. It just sort of gradually becomes more liquid-like as you heat it.
https://youtube.com/shorts/ERDmKW65t38
But it's a very small drop and they don't melt it all the way to the bulb. I imagine that it could shatter in some circumstances.
(Incidentally glass isn't a crystal, but that's just a nitpick.),