ODBC Source properties are missing in the Data Flow Task expressions dialogue

I am trying to create an SSIS package to transfer data from a MySQL database (ODBC Source) to SQL server (ADO.NET Destination).

I need to use a dynamic query for the extract from the MySQL database. In the past, I have done this by setting the SqlCommand property as an expression via the Data Flow Task properties window. However, no ODBC source properties are shown in the expressions dialogue.

I have tried deleting and re-creating the data flow task, with no improvement.

This does not appear to be a known bug (or, at least, I haven't managed to find anything by Googling). Can anyone suggest a solution for this, please?

I am using Visual Studio Professional 2017 (version 15.9.3) with SSIS Designer version 15.0.900.40

Thanks,

Rob