How do I Update prefabs I made in 2022 to be usable again

[lil_joha]

I found my old prefabs I made in 2022  I would like to update them but cant figure out how to remove the "missing block" markers. Is there a way to do this? 

 

[zztong]

There's a way to bring them forward version by version which does some block conversion. @stallionsden has done a lot of this. I have notes tucked away somewhere about the commands to issue. But if they were A19 prefabs, you would load up A20 and run a command, then load up A21 and run a command, etc. Until current. Then you'd have to manually replace any missing blocks that were still present. You're likely to encounter texture changes and block rotation issues too.

EDIT: I found my notes... https://docs.google.com/document/d/1E4vLr_DcM-kj-J8cx372H4uWdM41BJsWrnkP53OFv-I/edit?usp=drive_link