I wan't to force a crash to attach to my other issue, but I hold Fn+F3+C for 20 seconds, and release, the game didn't crash, but opened the debug screen.
Working keys:alt,shift
Doesn't work keys:Q,A,T,P,H,C,B,D,N,G,
MC-120248
Fn+F3+letters don't work
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Minecraft 1.12, Minecraft 1.12.1 Pre-Release 1, Minecraft 1.12.1
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Try pressing it without hitting the Fn key.