One case study suggests that tucking can cause testicular torsion.
A case study  found that one transwoman had testicular torsion as a result of tucking.
Testicular torsion – the rotation of the testes and subsequent arterial constriction – can present as severe acute unilateral scrotal pain, nausea, and vomiting. If permanent ischemic damage results, delay in treatment may be associated with decreased fertility, or may necessitate orchiectomy .
 Debarbo, C.J.M. (2020). Rare cause of testicular torsion in a transwoman: A case report. Urology Case Reports 33. [Link]
 Sharp, V. J., Kieran, K. & Arlen, A. M. (2013). Testicular Torsion: Diagnosis, Evaluation, and Management. Am Fam Physician 88 (12): 835-840. [Link]