After saving my searchable PDF file with Preview on macOS Sierra v10.12.2, the file is no longer searchable.
Text information embedded in searchable PDF files is removed and the files are no longer searchable when you open and save them with Preview on macOS Sierra v10.12.2.
This problem occurs not only with PDF files generated with our software but also those generated with other party software (such as Adobe® Acrobat®).
[How to recover]
To make the PDF file searchable again, convert it to searchable again by using our software for converting files to searchable PDF that comes with ScanSnap or other party's similar software.
It is strongly recommended not to use Preview on macOS Sierra v10.12.2 to edit searchable PDF files, but to use other software that is capable of editing PDF files.