[CMT8.4.1.1209]When don't choose migrate data, only choose create and replace. The progress isn't good

1 Clear all
2 Click one table in left tree
3 Click create and replace in one table UI.
4 Choose some field.
5 Do migration from online to online.
Actual result:
After migration, can see there are 4 records, but hasn't export and import anyone.

Suggestion,
In this condition, it display - will be good. when migrate data, and there isn't any data will display 0.