100 percent polyester = "tumble dry low" vs "do not tumble dry"

There is 100 percent polyester clothing that has care tags “Tumble dry low.”

Then there is 100 percent polyester clothing that says “Do not tumble dry.”

Are there different…versions of polyester? And if one uses a dryer to dry polyester that says “don’t dry in dryer,” is it going to melt the stuff?