Thank you so much for the continued updates. It is good to see that DevonThink is actively revised. Unfortunately, this update still does not fix PDFkit issues in Mac OS Sierra. At least not for me. “Convert to searchable” produces a copy of the same document, with no text. May be in the next version?
I am seeing no issues with this here. Please start a Support Ticket.
Do you use a public beta of 10.12.2? The latest public betas destroy the text layer of PDF documents generated by the Abbyy engine, therefore please use the Feedback Assistant (see folder /Applications/Utilities) to send a bug report to Apple.