I built Sodium from source from the 1.16.x/stable branch and the game crashes just before entering the main menu screen after launch. I use Minecraft 1.16.4 and fabric 0.10.6 build 214.
The error window says:

The game crashed whilst rendering screen
Error: java.lang.NoSuchMethodError: java.nio.ByteBuffer.clear()Ljava/nio/ByteBuffer;
Exit Code: -1

Here is the the crash report file:
crash-2020-11-08_03.12.46-client.txt

Duplicate of #16. You need to build with Java 8 if you are going to run with Java 8. At the moment Sodium uses Java 14 to build the stable branch in GitHub Actions, there is a Pull Request open to change this.

You can use a service such as JitPack if you don’t have access to a JDK 8.