I found this workaround posted by @FransLeys in another thread, reposting it here in case it can help someone while we wait for the updated connector:
The dropdowns that can sync, can sync one way into a text field.
It is definitely roadmapped to make improvements to this.
The following workaround is valid for those sync scenarios whereby you need a dropdown for validation, but you dont necessarily expect this value to be changed on both sides of the sync.
1) define the dropdown in the app where you expect manual user input going into this dropdown (for validation).
2) create a corresponding text field in the other app where you dont expect users to manually make changes to this field.
3) set up the field mapping in data sync - it will automatically default to one-way.