Fabric API for 1.19 is incompatible with dev servers using Fabric API started by fabric-loom

The following setup is incompatible:

Server: dev server started using fabric-loom runServer, only fabric-api added using modImplementation - the mod itself I used during my test is just a placeholder and does nothing

Client: latest fabric api loaded

Issue:

Other reports in the discord also mentioned this exact error being logged:

[15:12:37] [Render thread/ERROR]: Registry remapping failed!
net.fabricmc.fabric.impl.registry.sync.RemapException: Received ID map for minecraft:command_argument_type contains IDs unknown to the receiver!
 - minecraft:test_class
 - minecraft:test_argument

[12122234]

hey please help me even that i have fabric API i cant run my mod because it says that i dont have fabric API… What do i do?

[warjort]

I assume the client is not in a development environment?

The issue is the fabric gametest mod does different things in a development environment, see for example here: https://github.com/FabricMC/fabric/blob/1.19/fabric-gametest-api-v1/src/main/java/net/fabricmc/fabric/mixin/gametest/ArgumentTypesMixin.java

You can exclude the gametest mod in the development environment like this:

  modImplementation("net.fabricmc.fabric-api:fabric-api:${project.fabric_version}") {
      exclude group: "net.fabricmc.fabric-api", module: "fabric-gametest-api-v1"
    }