There's a new exam based on NSX 4.x for the VCAP-NV Design certification: https://www.vmware.com/learning/certification/vcap-nv-design-4x-exam.html
Until the end of June 2024 you now have a choice of taking the 3.x version exam or 4.x version exam towards the certification - you'll be awarded the same certification (currently VCAP-NV Design 2023) whichever of the two exams you pass.
To earn the VCAP-NV Design 2023 certification, you can choose between NSX 3.x and 4.x exams until June 2024. Both exams grant the same certification.
Details: https://www.vmware.com/learning/certification.html