https://test.wikidata.org/w/index.php?title=Q7&action=history
https://test.wikidata.org/w/index.php?title=Q194&action=history
See https://www.wikidata.org/wiki/MediaWiki_talk:Gadget-Merge.js#New_merge_API
It seems the first of the two edits was made (removing the data from the first item). but the second edit (adding the data to the second item) never went through.
Version: master
Severity: major
Whiteboard: u=dev c=backend p=8