The problem stems from the framework mod. While it primarily provides animations and equipment for NSFW modding, its character behavior files inadvertently interfere with the vanilla death sequences of small creatures.
Community discussions on Reddit suggest that is largely obsolete and prone to such bugs. Updating to ZaZ 8.0+ or higher (often available on LoversLab ) may resolve some legacy animation conflicts naturally. Rabbits stuck in running animation upon death - Skyrim SE ZaZ Rabbit and Chicken Death Fix for ZaZ Animat...
: After making these changes, it is standard practice to run FNIS or Nemesis Unlimited Behavior Engine to update your game's animation registry. Recommended Versions The problem stems from the framework mod