1.2.1:

• 1.21.9(-11): Update to 1.21.11
• 1.21(.1): Fix registration of block entities happening too early on Neoforge¹
• Reduce required Fabric Loader version by one minor version (from >=0.18.0 to >=0.17.0)

¹^{: Not explicitly supported yet, via Sinytra Connector (  )}

Looking for changes of previous versions?
You can find them in the changelog history/CHANGELOG_history.md).