BBH_ayyyy The ideal workflow would be to match the editor and runtime versions
https://esotericsoftware.com/spine-versioning
Data loss is inevitable when exporting from newer versions to older ones, because the further we go, the more the data format changes, so ideally you'd have to work in 3.8, or update the runtimes to 4.3 to get both the editr and runtime to match.
