Yesterday I knocked my SG 50s tribute (no neck binding) from a flimsy stand. It took a forward nose dive and didn't play 12th fret notes anymore afterwards. After some panicked troubleshooting I determined that the 13th fret came loose and is sticking out a bit.
Just press it back in with a fret press and apply some super glue on both sides of the fret? (that's one area of guitar maintenance I have never done so far).
I ordered this one from Amazon, hopefully it can do the job:
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