If I were to guess… I would guess this is an issue with tags having diacritic’s in them, since my tagcons are migrating just fine at this point… but thats just a guess. ¯_(ツ)_/¯
By looking at the screenshots reported here and in other threads my suspect is the missing tagcons are the ones automatically associated by Bear. In @KillerWhale screenshots idées is automatically associated with the light bulb by considering the device’s preferred languages and some dictionary files we have inside the app.
Unfortunately, I struggle to confirm my hypothesis on my and other mac but I want to ask which preferred languages you currently have set in System Preferences > Language & Region
If you are willing to share your B1 database with me privately, please contact me via DM it will be extremely helpful to solve this mystery.
I can’t unfortunately share my DB as there’s really too much personal stuff in there, but I think you found the issue. I am operating with a French system and it does indeed seem that most missing TagCons correspond to their French names. More of them: