Convert String to Timestamp dialog box missing

It seems there used to be a dialog that would pop up, that would query the user for parameters when attempting to change a string column to a timestamp type (similar to converting a string to date). This dialog is missing and all conversions are attempted as cast to timestamp:

In the case of venues_processing_dttm this will always yield null. Here's some scala that shows some data that will convert to timestamp when doing a direct cast to "timestamp"