On the Wikidata Query Service UI, the autocomplete feature doesn't fully work for the ontolex prefix: it appears when I type "ontolex" but is not available anymore if I add the ":" after "ontolex".

Steps to reproduce:

• In https://query.wikidata.org/, type "ontolex" then Ctrl+Space: the list of options appears

• Now type "ontolex:" or anything expected like "ontolex:sense" and try Ctrl+Space again: the autocomplete is not triggered and the error message "unknown prefix: 'ontolex:'" appears

This behaviour is different from the other prefixes, for example wd:, where the autocomplete feature can be triggered after typing ":". This is confusing for people who are used to start typing the option they are looking for then activate the autocomplete feature.