IC can light with holes
Yes it's normal.

The holes do not go all the way through but to a space that is covered by another can that does not have holes and can be in contact with the insulation.

Just in case there is also a thermal safety switch within the fixture that automatically turns off the light when too much heat from the bulb has been trapped and the temperature to rise to a certain point. Once the fixture has cooled, the switch turns the light back on again.