Mix shrimp, crab, cream cheese, mozzarella, Parmesan, garlic, parsley, seasoning, salt, and pepper until smooth, letting it soften slightly if too thick.
Preheat oven to 375°F, line a baking sheet, and arrange crescent dough triangles in a circle with overlapping bases and points facing outward.
Spread the seafood mixture evenly along the inner ring without overfilling.
Fold the dough points over the filling and tuck underneath to seal securely.
Brush with egg, drizzle garlic butter, and bake for 22–25 minutes until golden and crisp, then cool slightly before slicing.