I have an odd issue with OCR that was present in previous betas but I didn't get around to reporting it.
There are a couple of lines in a PDF doco that I have that Block Recogniser refuses to recognise. The other modes don't have any problems and I can't see what's wrong with these lines that would stop them being recognised.
In the attached screen shots you can see that there are two indented lines about 1/4 of the way down that don't get recognised, and closer to the bottom, a line starting with "OK" doesn't work either.
If I switch to either of the other two modes, the lines are recognised.
If I switch back to Block Recogniser and resize the box so that it is smaller, it still doesn't see these two lines.
It's not new in Beta 6/7/8 and I don't think it's worth holding up the release for this, but it does look like a bug to me and I thought you might like to add it to the queue of things to look at.