I tried translating the article [[Ambrose Bierce]] from English to several different languages.

In the source column every superscript footnote number shows up twice: [1][1], [2][2], [3][3], instead of [1], [2], [3].

This happens in several languages. I couldn't see this in other articles.

See the screenshot - notice the superscript numbers in the English column on the right-hand side:

This happens in the translation column as well when adapting the reference using the reference tool: