Re-questioning If Plastic is Microwavable

As a kid, I was always told that plastic is not microwavable, and even if you use the wrap and stuff, the plastic wraps should not be in direct contact with the food.

Here is a frozen noodle where the sauce is put in a plastic bag and it asks me to have the bag face up as I microwave it for 6 minutes.

In fact, the bag was designed so that the steam could escape while it heats up.

But at the end of the day, it was still a plastic bag I was heating up for 6 minutes... I do not know what is real anymore.