Parent tag not created on open/import old db file (2.0.2)

1. Create empty db file in CN 1.5.6

2. Create couple notes with nested tags

3. Open this db in CN 2.0.2

4. Open and save (OK) any note

Result: 'virtual' parent tag appears

Same happens on both "Open" and "Import" actions with old .db.

It looks weird that a tag appears when I didn't change a note in any way. I would expect these virtual tags to be autocreated.