I am using SQLDev 19.2.0.206 with the jdts-1.2.8.jar ODBC Driver.
I have a SQL Server Database which has multiple schemata containing the same set of tables (using the schema to separate dev, test, etc).
When I double click a table in the Connection browser, the Column list opens and shows one entry per column, per schema.
for example - this table appears in 7 schemas:

and shows like this:

etc...
The Column list isn't filtered by the Schema name, only by the Table name.
Expected: it should only show the columns for the instance of the table in the schema on which I clicked...
Note: If I show the data, it correctly shows the data for the table in the selected schema...