In a recent update, a warning was added that will pop up before spawning to notify you that a NOTAM (Notice to Airmen) is active at the airport or in the area. For TFRs (Temporary Flight Restriction) however, no such warning will display before spawning.
Some TFRs state that you will be reported by ATC, without warning, so you always need to check the airspace on the map for colored circles. Click the circle to pull up it’s information.
Be prepared and be aware, you’ll never get in trouble with that in your mind.