Given what you already know about your child, Irena, I'd say this is just another piece of information to back up that he's clearly not processing letters/sounds in a "normal" way. Now, as to whether or not that's concerning and worth further testing... I don't know. If he's reading at level, the school certainly isn't going to do anything for you. But if it is stealth dyslexia, you might be able to work on that at home.
I'm getting more and more concerned that my DD7 has dyslexia, but she always passed those dibels tests and reads above level... now that she's in 2nd grade and STILL doesn't know which direction to write 'b' and 'd' and 'p' and 'g' and 's' and 'z' the teacher is FINALLY FINALLY FINALLY concerned along with me. But I still don't know what/if anything they'll do. I'm waiting for her winter assessment scores then I'm going to ask them to test/assess... at least that'll be one set of free tests that I can use to figure out what's going on.
