@xuv just press firmly on the top after proofing and before lambing (making cuts). helps distribute internal gas bubbles
@xuv @hob this is just a hunch but I believe it is maybe related to the scoring - having two cuts meet a one corner may weaken the crust and create an imbalance in the gas exhaust dynamics. Also make sure you use the sharpest thing available to score, and never cut at 90° relative to the surface. Finally, the pattern may be too sophisticated. A simple large X shape worked for me until I felt confident to experiment more. Finally as others have said it looks delicious!
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