I once had a joy flight in a private Tiger Moth where we had taken off from a farm to land back at the local aerodrome. As we approached the runway the aircraft was appearing to miss the runway and as the pilot was elderly I was slightly concerned. We landed on the grass within the runway strip safely and I learnt a bit about tail skids. Years later I saw aerodrome operators in a tizz over a Tiger Moth doing exactly the same thing at a controlled airport. Apparently the grass isn't always safe to land on in their opinion. Not sure if there's anything letting a pilot know this limitation.
I was slightly concerned that the grass wasn't deemed to be safe within the runway strip.