The customer environments had been upgraded from 25.1 (unknown SU) to 25.2.3.
I was going to import a migration job that was previously used in the project and imported several times without problems. The import was done using the standard job FNDMIG_IMPORT and suddenly it went wrong with error message ""The uploaded CSV is malformed".

Investigation showed that the export file for the migration job contained the character ", a double quote, which caused the issue.
The double quotation was used to restore a text, where double quotation had been replaced by something else in the data export.

The double quote was replaced by CHR(34) and then the job was imported successfully.

