As a Wikidata Admin, when I click the RevisionDelete button to remove an entry from a page's history I do not get feedback whether the operation failed or succeeded, but when I press the button again I do get an error message that the revision has already been deleted.
I would like to see some indication of a successful operation when I use the RevisionDelete button on Wikidata on the first click.
See report on Wikidata:Contact the development team#Revision-deletion result.