Currently, there is no official support for Unity6 with Spine runtimes, as the latest officially supported Unity version is 2023.1 for Spine 4.1 and 4.2. If you have not encountered any issues during your build testing with Spine 4.1 in Unity6, you may continue using it, but be aware that any potential issues might not be addressed by official support. Regarding stability, upgrading to Spine 4.2 could provide additional bug fixes and improvements, but if Spine 4.1 is working well for your project, an upgrade may not be necessary unless you encounter specific issues that are resolved in the newer version.
