On August 17, 2021, Adobe announced that they were beginning the process of discontinuing Photoshop's 3D features, due to 'technical reasons'. You can read the announcement on this page: https://helpx.adobe.com/photoshop/kb/3d-faq.html
Adobe provided no further information regarding to how long this transitional period will last. I decided to make certain changes immediately:
Note: if you own Photoshop CS6 Extended and you buy the "Jigsaw Puzzles" and/or the "Mockups" products, you can ask to receive the legacy (CS6) version of the 3D actions.
The following free 3D add-ons have been discontinued: