Describe the bug
When playing the new local (split screen) co-op for 1.5, the game always freezes when the fourth player joins or attempts to join. This does not happen in vanilla, but it happens in SMAPI with zero mods installed, both when loading a game or creating a new game. I launch the game via Steam.

To Reproduce

1. Connect four controllers.
2. Launch game.
3. Create a new farm with three cabins.
4. Enable local co-op.
5. Join with second character. (Error messages occur in SMAPI console, but game works)
6. Join with third character. (Error messages occur in SMAPI console, but game works)
7. Attempt to join with fourth character.
8. Game freezes. (SMAPI console repeats the same message forever. I must manually close.)

Log file
https://smapi.io/log/ab5d8c764a2e4bea98ed2b06b076d96f

Screenshots
N/A

I haven't tested if mods work in local co-op despite the error (playing with only two or three players). I haven't tested four players in a combination of network and local co-op (eg. two players join via split screen, one player joins via Steam).

Also reported here on Reddit, with a similar log. This seems to be an issue with the peer context/connection tracking, since both logs shows endless unexpected reconnections.

Fixed in develop for the upcoming SMAPI 3.8.2.