My girlfriend and I both have Switches with CFW running. When Animal Crossing: NH came out, we were able to play locally no problem on FW 9.2.0. When the 1.2 update for AC:NH came out, we updated to 10.0.1 FW and Atmosphere 0.11.1 (through Kosmos), but our local multiplayer stopped working. It would connect, then drop before you could even start playing. I tried Pokemon Let's Go to see if it was just the game, and trying to start a Link Battle on it crashes Atmosphere altogether. I waited...
Crash on local multiplayer
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Crash on local multiplayer
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