With Cardinal Components API installed, alongside a Fabric mod that adds a Component that requires syncing between client and server (in this case, Trickster), the client disconnects immediately after joining a dedicated server. (singleplayer works fine)

latest.log (client): https://gist.github.com/unilock/9ea8f4888b3ecffbb023474066bb9b4d
latest.log (server): https://gist.github.com/unilock/c5f16e51b70fc77c8f14864afb8fb019

To reproduce:

1. Set up a Minecraft 1.21.1 client and server with NeoForge 21.1.77
2. Install the following mods on both sides:

• Sinytra Connector v2.0.0-beta.3+1.21.1
• Forgified Fabric API v0.104.0+2.0.18+1.21.1
• Cardinal Components API v6.1.2
• Trickster (specifically this build with Sinytra Connector support)
• Accessories v1.1.0-beta.16+1.21.1
• CICADA v0.9.1+1.21-1.21.1
• Lavender v0.1.14+1.21
• owo-lib v0.12.15-beta.9+1.21

3. Start the client and the server
4. Attempt to join the server from the client
5. Disconnect due to This server requires Cardinal Components API (unhandled packet: cardinal-components:entity_sync)

Wasn't this fixed in 2.0.17? Or did it break again?

Testing v2.0.16 and v2.0.18 had the same results, as described here. v2.0.17 leads to a disconnect similar to that of #166 and Sinytra/Connector#1512 (on a dedicated server, not singleplayer!)

Sometimes, the game does let me join, but the server log is spammed with:

[Netty Server IO #1/WARN] [ne.ne.ne.ne.re.NetworkRegistry/]: No registration for payload cardinal-components:chunk_sync; refusing to decode.
[Netty Server IO #1/WARN] [ne.ne.ne.ne.re.NetworkRegistry/]: No registration for payload cardinal-components:entity_sync; refusing to decode.

...among similar messages for other payload types from Fabric mods.

Should be fixed by #170, haven't tested

#170 does appear to have fixed the issue :)