1.2.0:

• 1.21.9(10): Update to 1.21.10
• 1.21.4(5), 1.21.6(-8): Combine versions into 1.2.4(-8)
• 1.21(.1), 1.2.4(-8):

  ⚠ Breaking change:

Empty all Feeding Trough variants before updating.
Items left inside any Feeding Trough variant on versions < 1.2.0 will be lost after upgrade.

Required actions:

• Empty every Feeding Trough variant's inventory.
• (Potentially necessary*) Break and re-place existing Feeding Trough variant blocks.

Technical summary:
The variants' blocks now use the original Animal Feeding Trough's block entity instead of a separate custom block entity. This unification improves cross-version compatibility (e.g. the newly combined version 1.21.4(-8)), stability, and maintainability.
1.20.1 versions are unaffected as the Fabric feature*² allowing this change was only added in 1.21.

^{*: In testing, this was not necessary, but if you encounter issues with existing Feeding Trough blocks after updating, breaking and re-placing them should resolve the issue.
*²: FabricBlockEntityType.addSupportedBlock()}

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