I am working through the text of Revelation, and think I may have found an error in the CNTTS.
At Revelation 20:6, the CNTTS lists Alexandrinus (A02) as having the future tense of "reign" (βασιλευσουσιν), however, I have examined the manuscript (thanks to Accordances manuscripts module!), and A02 appears to actually have the present tense (βασιλευουσιν). This error would be easy to make as the manuscript script for sigma looks like a "c", and thus an omicron could easily be read as a sigma.
I will attach a screen shot below.
P.S. Not sure if the screenshot worked, but thought I'd let ya know!