Using a non-English version of the website, go to the relationship editor of a release, click “Add related work”, then in the search dialogue choose “Add a new work”.

An add work dialogue pops up (see screenshot), but the work attributes dropdown is empty, and a message is shown that “This attribute is used only for grouping, please select a subtype.”

This seems to happen for all languages except English, on both the beta and main site.

Possibly related to MBS-8486.