I apologize if there is a similar issue opened, but I couldn't find it.

Normally, if you hover over an artist, their sort name (+ disambiguation) will be displayed. However, if the artist is credited by a different name as is their entity name, it will be displayed as "entity name - sort name (+ disambiguation)". I think it should show the custom name rather than the default entity name now that it adds the extra information.

Additionally, I found an odd tool-tip with an "undefined" text, not sure why this happens. This is the track where it occurs: https://musicbrainz.org/recording/ca0e0413-c086-431a-b0ac-8795aca5aa30. (edit: It only happens when editing the recording (from the recording tab) and not the release. Also happens when editing recordings on this release: https://musicbrainz.org/release/2260aedd-155d-33b0-a4bb-6db7ce3f6598).

Attaching several screenshots of this issue (artists before and after crediting them with a different name - one for each artist who has same/different sort name, last screenshot is for the undefined tool-tip).

Thanks for the fix