To potentially resolve your issue, ensure that:
- Your Spine Editor version matches the Spine Runtimes version you are using in your project.
- You have updated both the spine-ue4 plugin and the spine-cpp runtimes to their latest versions, as outdated versions can lead to crashes and other issues.
If your problem persists, it might be related to a specific issue with the Spine UE4 plugin's handling of garbage collection when frequently switching animations. In such cases, ensuring that all your runtime and editor versions are up to date and following best practices for asset management in UE5.3, as outlined in the spine-ue4 Runtime Documentation, is advisable. Otherwise, staff will be along shortly to help you further.