We just released SmartSearch version 3.0.1. This new version concludes out transition to Solr 8.6.3. We updated the internally used SolrJ version to 8.6.3 - no manual steps are required.
We also fixed an issue in the Smart Search Connect module regarding the language of a document or to be more precise the content of the language facet.
For further information please refer to the release notes, and we hope you enjoy the new version.