Seems the issue appears only on first save - when user is creating translation in FR (or other locale). Because by manually editing page and saving it once again without modification - it will transform _Voiture_ into glossary reference thanks to [_onEvent_|https://github.com/xwiki-contrib/application-glossary/blob/7a1a4bccc050b086f749015aa90614dab1d32207/application-glossary-api/src/main/java/org/xwiki/contrib/glossary/internal/GlossaryDocumentSaveEventListener.java#L84-L118] method.
In this one [GLOSSARY-62|https://jira.xwiki.org/browse/GLOSSARY-62], once I enable debug for glossary application on re-save attempt that fix the issue, I only observe the [line|https://github.com/xwiki-contrib/application-glossary/blob/7a1a4bccc050b086f749015aa90614dab1d32207/application-glossary-ui/src/main/resources/Glossary/Code/GlossaryEntriesTransformerJob.xml#L226] in logs how much time it took.
This message was sent by Atlassian Jira (v9.3.0#930000-sha1:287aeb6)
If image attachments aren't displayed, see this article.