Strange.. I have a save I started on December 10th 2021 and I have the silverhand arm equipped. Try the following steps, it might help fix your game:
Go to where cyberpunk 2077 is installed
Delete all the folders except for the "content" folder (the one that contains the .archive files) and the "BonusContent" folder. If you have mods inside the "content" folder, remove those too.
Go to Saved Games > CD PROJEKT RED > Cyberpunk 2077 and make a copy of your latest save to your desktop and then delete the rest.
Verify your game. A download should start (~2GB).
Steam: Library > Cyberpunk 2077 > Settings > Properties > Local Files > Verify Integrity of Game Files.
GOG: Library > Cyberpunk 2077 > More > Manage Installation > Verify / Repair...
Epic Games: Library > Cyberpunk 2077 > Menu (three dots under game cover) > Verify
After the verification is done, move your save file back to Saved Games > CD PROJEKT RED > Cyberpunk 2077
Hope this solves the problem, if you need more help just ask :D