New Damage gamerules automatically turned to false

When a world gets converted to 19w36a the Gamerules firedamage, drowningdamage and falldamage are automatically turned to false, while their normal state should be true.

My world was generated in 1.14.4 but converted to 19w36a from the previous snapshot.
Did not encounter this issue when generating a new world in 19w36a.