OCR should recognize industry standard OCR characters and optical scan/reader codes
Acrobat DC for Mac's OCR continuously mis-recognizes standardized OCR characters such as those on checks and commercial forms. Those characters are designed to be highly readable at high speed and a standard quality scan (let alone a high quality one) should be sufficient for proper recognition by Acrobat.
Similarly, it routinely tries to translate address codes (the string of full and half-height vertical bars used by postal readers to sort mail), even if it does occasionally recognize the entire code as one "word." Fortunately, it usually includes it for review, but it shouldn't be difficult to recognize the standardized format, or even catch that "IiIII1II1IIi!ii" is highly unlikely to not be text, especially when it goes on for 2-3+ inches. (If anything, I would expect Acrobat to recognize the code as its alphanumeric translation--not a feature I'm requesting.)
QR-type codes also should be recognizable as such. Both the large consumer size and the small "thumbnail" commercial size found on forms and bills are a standard that Acrobat's OCR engine "knows" and doesn't try to recognize as text characters.
All cases are consistent errors based on 300 ppi black & white scans with no compression, from "crisp" printing and no background. This has been replicated on four scanners from three separate manufacturers, two sheet-fed only (Brother and Epson) and two both sheet-fed and single page from the platen glass (high- and mid-grade HP OfficeJet series).