When translating the Meg Johnson article from English to Spanish an infobox based on the Infobox writer template is in the source article. This template is not available in Spanish{F34946467}. However, adding it to the translation results in the Infobox Writer template added to the translation and a "translation failed" message shown:

The expected behaviour would be for the template not to be added to the translation and a warning indicating that the template is not available to be shown.

Additional observations:

• In Spanish Wikipedia there is a redirect for "Infobox writer" to a different template (Plantilla:Ficha_de_persona). But since it is not connected on Wikidata it is not expected to interfere.
• A warning for the template not being available is shown. However, it seems to be treated as an in-line template where the source contents are supposed to be added as plain text. However, the source contents are added here as a template instead.
• When the article is loaded an error is shown related to the MT which does not seem to happen in other articles. So it may be related to the pre-fetching of the translation for this content. (video below)