When logged in into the developer console at /cms/console and trying to export content as YAML using 'Show export in this window'. The displayed YAML content contains encoding failures.
For example, when using the German language, there are a lot of ü, ä and ß. A word like "Persönlichen" will be converted into "PersÃ¶nlichen"
Auto export and ZIP export work fine though.
For the record, we're running 12.3.0.