Describe the bug
I added your mod to an existing project using modLocalRuntime "maven.modrinth:c2me-fabric:0.3.4.0.0+1.21.8"

This resulted in:

[18:00:00] [main/ERROR] (FabricLoader) Incompatible mods found!
 net.fabricmc.loader.impl.FormattedException: Some of your mods are incompatible with the game or each other!
A potential solution has been determined, this may resolve your problem:
	 - Install c2me-base, any version.
More details:
	 - Mod 'Concurrent Chunk Management Engine' (c2me) 0.3.4.0.0+1.21.8 requires any version of c2me-base, which is missing!
	at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:51) ~[fabric-loader-0.17.2.jar:?]

The problem is likely caused by this line of code:

To Reproduce

1. Ensure that your project can resolve dependencies using modrinth.
2. Add the mod as a dependency using ```modLocalRuntime "maven.modrinth:c2me-fabric:0.3.4.0.0+1.21.8"
3. See error

Runtime info (please complete the following information):

• OS: -
• Minecraft version: 1.21.8
• Mod version: c2me-fabric:0.3.4.0.0+1.21.8
• Mod branch: (fill this if you are not using the default ver branches)

Checklist

• I am using the official version of the mod.
• I tried the latest development version but the issue persists.
• I searched for similar open issues and could not find an existing bug report on this.

You have to add all jar-in-jar mods, and using modLocalRuntime doesn't do that automatically for you.