For updating ATICAS - Eunola has taken on the task of keeping this updated over at https://theofficialeunola.myportfolio.com/all-traits. Every name has been updated to (for example) Eunola_trait_Expressionistic, whereas before it would've been just trait_Expressionistic, so to reapply traits that are part of ATICAS, I recommend doing the following (this is basically just the workaround I put in the description above, but for sorting out all of the ATICAS traits at once):
- make the .json file as above
- replace old ATICAS files with the new files
- load up the game again and enter 64bit
- check if there are any 64bit ID traits in that list where the name is of the form "<class 'sims4.tuning.instances.trait_TRAITNAME>"
- open up the .json file, and find and replace ".trait_" with ".Eunola_trait_" (without the "", and it's worth putting the . at the start so that it doesn't affect other trait names with trait_ in them somewhere) - you can click replace all if there were no traits in the list above, but if there were, then just be careful not to replace those
- run 64bit_replace followed by 64bit_export
- ATICAS is now sorted!