This is something really bug me when mod try to save mod progression on both character and world as using wrong character can ruin everything and .... its happen to me now.

I have 2 worlds one for playing with friend and another for solo also with 2 characters.
co-op world is already beat WoL, solo is just arrive HM.

I accident enter co-op world with my solo character which..... should not have any problem in any other mod BUT TAS ... is weird in every aspect. Like inconsistency with boss dmg.

No sync asking at all (never choose to sync world progress) and I feel like .... oh please fox.... and yup.... I exit co-op world and return to solo world. Just to see all ability unlock and now she don't stop try to give every essence for boss up to ML.

For some reason I don't understand, create new character and enter solo world also unlock up to WoL ability without asking any sync. I guess TAS use kind of universal save as outfit and prism go between character too.

I don't know ..... at least make it do thing like how Terraria save file work properly should solve problem?

This really kill all the fun of TSA for me. I mean, why bother do multi-character if progressing can be bug and have permanent NG+ to other character unless complete wipe the game save file? ... when I want to do it in Terraria?