It looks like it still had lots of 'push' when you put it in the oven. Maybe let it rise for a bit longer (even an hour) before you bake it. How is it inside? Twenty minutes seems a short bake.
Baked with 2 pans of water for steam. Definitely done crumb is good. Just explodes out of the scores, especially in the middle. Will try longer 2nd proof...to 90%. Cut down the proof time because the larger loaf was unmangeble, would deform on transfer and scoring also deformed and dragged the crust.
Most likely premature drying of crust before oven spring and uneven deflation of dough gasses before shaping.
Humidity? Cover? Altitude? Steam? Ambient and dough temperature?
How many other loaves in the batch looked the same? Is this a scored or a twisted shape?
It looks like it still had lots of 'push' when you put it in the oven. Maybe let it rise for a bit longer (even an hour) before you bake it. How is it inside? Twenty minutes seems a short bake.
Le the dough rise 90% before baling
Baked with 2 pans of water for steam. Definitely done crumb is good. Just explodes out of the scores, especially in the middle. Will try longer 2nd proof...to 90%. Cut down the proof time because the larger loaf was unmangeble, would deform on transfer and scoring also deformed and dragged the crust.