On Level 4 beam, what is the penalty for a dismount with a failure to perform the 1/4 turn?

The penalty for a dismount with a failure to perform the 1/4 turn on Level 4 beam is indeed 0.20. In gymnastics, specific deductions are defined for various execution errors, and a lack of required turns during a dismount is one of those execution errors. For Level 4, performing a 1/4 turn is part of the expected skill requirement for the dismount, and failing to perform this turn results in a designated deduction of 0.20. This specific consequence helps maintain consistency in scoring and emphasizes the importance of completing all elements of a routine as per the level's requirements. Points are deducted to reflect the gymnast's adherence to the routine's standards, thereby encouraging the development of proper technique and execution.