The PDF itself was OCRed in the latest updated Devonthink desktop version (September OCR update).
When annotating (writing on pdf) in random moments a long line appears (the flow of the pencil is disrupted, and then it comes back a few millimetres later), it occurs 1 per 10/20 words, I couldn’t replicate it writing the same word over and over
(I could send pdf if developers want to check it)