I am currently using both the ST Classic and New ST apps (I was migrated). My AT works great, but I have noticed that items uniquely added to the new ST app (my newer Samsung Powerbot R7070 vacuum) and Automations, are not showing in AT. I went back to my location to authorize the vacuum, but it was not listed. Went into the IDE, and it is not there either. However, it is in the new ST app, and it works from there.
My routines in ST Classic are available in AT, but the automations I set up are not.
To provide more info, I only have 1 location in the IDE that both ST CLassic and the new ST feed off of. I made sure to eliminate the new location from the migration so they were both attached to the same devices and handlers.