Emulator

Game Name?

Animal Crossing - GAFE01

What's the problem? Describe what went wrong in few words.

When connecting a GBA and attempting to play an NES game on the GBA, this pops up.
"Zelda uCode (light version): unknown/unsupported command 0C"

Turning off panic handlers just causes a failed GCN <-> GBA connection.

What did you expect to happen instead?

I expected to do something needlessly complicated in Dolphin.

What steps will reproduce the problem?
[Don't assume we have ever played the game and know any level names. Be as
specific as possible.]

1. Play Animal Crossing for way too long.
2. Unlock NES games (or use a cheat/100% save)
3. Attempt to play the NES game over the GBA using the Advance Play option at an NES.
4. Turn off panic handlers if you want to see it fail to send.

Dolphin 3.5 and 3.5-367 are old versions of Dolphin that have
known issues and bugs, so don't report issues about them and test the
latest Dolphin version first.
Which versions of Dolphin did you test on?

4.0-5692-dirty; aka, PR2139, the GBA <-> GCN link update.

Does using an older version of Dolphin solve your issue? If yes, which
versions of Dolphin used to work?

Yeah, right.

What are your PC specifications? (including, but not limited to: Operating
System, CPU and GPU)

Core i5 3570K, GTX 760, Windows 7 x64

The only other thing to note is that it works fine on LLE audio.