Environment: production (example)
GIVEN I am on a lexeme page
AND I have edit permission
WHEN I click edit on a form of the lexeme
AND it has grammatical features (pills) already
AND I type backspace to start editing a preexisting grammatical feature
THEN I see "[object Object]" instead of the Q-id / the label of the item (for product to specify)
Likely caused by https://gerrit.wikimedia.org/r/c/mediawiki/core/+/491943/1/resources/lib/ooui/oojs-ui-widgets.js#b4390 for T216075
Discovered while tinkering with T219134